is x=15 degrees a solution of radical 3/3 cos2x+sin2x=0

39,728 results
  1. Trigonometry

    find sin2x, cos2x, and tan2x if sinx= -2/sqrt 5 and x terminates in quadrant III

  2. Math

    Solve the equation sin2x=2cos2x, for 0 degrees

  3. Adv function

    Express sec2x in terms of tanx and secx I know you have to sec(2x) = 1/cos(2x) = 1/(cos²x - sin²x) But how do you split that. Like how to simplify that?

  4. Trigonometry

    Prove: 1-tanx/1+tanx=1-sin2x/cos2x

  5. Trigonometry

    Simplify the expression using trig identities: 1. (sin4x - cos4x)/(sin2x -cos2x) 2. (sinx(cotx)+cosx)/(2cotx)

  6. trigonometry

    if sin2x=3sin2y, prove that: 2tan(x-y)=tan(x+y) ( here, in sin2x, 2x is an angle., like there's a formula:sin2x=2sinxcosx and sin2y=2sinycosy; ....)

  7. dai so

    chung minh dang thuc (1+Sin2x)/Cos2x=Tan(pi/4+x)

  8. trig

    sinx = 4/5 and x terminates in Quadrant II Find sin2x and cos2x How to get the answers, which are sin2x = -24/25, cos2x = -7/25?

  9. PreCalculus

    Sin5x cos2x + cos5x sin2x=

  10. Math

    Solve the equation 2cos2x = √3 for 0°≤x≤360° I did this: cos2x = √3 /2 2x=30 x=15 x=15, 165, 195, 345 Is this correct? Solve the equation √3 sin2x + cos2x = 0 for -π≤x≤π No idea how to approach this one Thanks a bunch for the help!

  11. math

    angle x lies in the third quadrant and tanx=7/24 determiner an exact value for cos2x determiner an exact value for sin2x

  12. math

    Solve sin2x + sin4x = cos2x + cos 4x for x in the interval[0,2pi) Hint: the following substitution should come in handy: sin3x= cos3x . tan3x

  13. Trig

    Simplify: (cosx + cos2x + cos3x + cos4x + cos5x + cos6x) / (sinx + sin2x + sin3x + sin4x + sin5x + sin6x) into a single Cotangent function. Using the sum-to-products, I was able to get remove some of the addition in attempts to get full multiplication, but

  14. algebra

    solve the equation or formula for the indicated variable R=ts^2+3 a)s=under radical R-3/t (not under radical b)s=everything under radical R-3/t c)s=R (under radical)-3/t d)s=everything under radical R/t-3 Thanks again I feel really stupid not being able to

  15. Math please help quick

    Which of the following are identities? Check all that apply. (Points : 2) sin2x = 1 - cos2x sin2x - cos2x = 1 tan2x = 1 + sec2x cot2x = csc2x - 1 Question 4. 4. Which of the following equations are identities? Check all that apply. (Points : 2) Question 5.

  16. trig

    tanx = 5/12 and sinx

  17. MATH

    Simplify: Sin2x/1-Cos2x

  18. pre calculus

    were doing sum and difference identities tan (225 degrees+60 degrees) i got to the part where its 1+radical 3/1-radical 3 what?

  19. trigonometry


  20. trigonometry

    Been trying this forever so it says: Simplify 1+sin2x+cos2x/1+sin2x-cos2x ive tried this problem so many times I need help with it...

  21. maths

    prove that 1+sin2x-cos2x / sin2x+cos2x = tanx

  22. math

    sin2x-cotx = -cotxcos2x Using the various trigonometric identities(i.e. double angle formulas, power reducing formulas, half angle formulas, quotient identities, etc.) verify the identity. I first added cotx to both sides to get sin2x = -cotxcos2x+cotx

  23. Pre Calculus

    Establish the following identity Sin2x/1+cos2x=tanx

  24. Maths

    Prove that sin2x+cos2x-1/sin2x+cos2x+1=tanx

  25. trig

    write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x

  26. Pre-Calc/Math

    Prove Identity: (1-cos2x/ tan x) = sin2x

  27. Pre-Calculus

    Find all solutions to the equation in the interval [0, 2pi) cos4x-cos2x=0 So,this is what i've done so far: cos4x-cos2x=0 cos2(2x)-cos2x (2cos^2(2x)-1)-(2cos^2(x)-1) No idea what to do next.

  28. Calculus

    Solve identity, (1-sin2x)/cos2x = cos2x/(1+sin2x) I tried starting from the right side, RS: =(cos²x-sin²x)/(1+2sinxcosx) =(cos²x-(1-cos²x))/(1+2sinxcosx) and the right side just goes in circle. May I get a hint to start off?

  29. trig

    Verify the trigonometric identity: [(1–sin²x)/sin²x]–[(csc²x–1)/cos²x]= -tan²x I still can't figure this out.


    ʃ (4sin²x cos²×/sin2x cos2x)dx PLEASE HELP!!

  31. pre-calculus

    tanx= -12/5 x in quadrant 2 find; sin2x= cos2x= tan2x=

  32. Pre-Calculus

    Verify the following identity: (sin2x)/sin - (cos2x)/cosx=secx

  33. math

    Prove the identity: 1-cos2x/sin2x = 1+tanx/1+cotx I simplified the RS to tanx. LS:(1-2cos²x+1)/2sinxcosx (2+2cos²x)/2sinxcosx How do I simplify the rest?

  34. calc

    Where do I start to prove this identity: sinx/cosx= 1-cos2x/sin2x please help!! Hint: Fractions are evil. Get rid of them. Well, cos2x = cos2x - sin2x, so 1-coscx = 1 - cos2x - sin2x = 1 - cos2x + sin2x You should be able to simplify this to 2*something

  35. Calculus grade 12

    solve for (

  36. MATH


  37. math

    what does sin2x/cos2x equal to?

  38. math


  39. trig

    secx = 4 in Q2 find sin2x,cos2x,tan2x

  40. Identities

    Verify the following identity cos2x/sin2x+sinx/cosx=csc2x

  41. trig identites

    since sin2x+√3cos2x=2sin(2x+60) find the general solution for the equation sin2x+√3cosx=0 thank you

  42. calc

    sin2x = (radical 3)/ 2 solve each equation on the interval [0,2pi)

  43. radical equation - no solution right?

    radical sign (w + 5) = 2 In all my problems there are a letter variable on the end example: radical sign (-u + 30) = u I then square both sides, drop the radical sign then (u+6)(u-5)=0 then check to see if they are both true I guess my question is this is

  44. Trig

    Prove the following functions: (sinx+sin2x)/(1+cosx+cos2x)=tan x (cos3x/sinx)+(sin3x/cosx)=2cot2x tan2x=(2/cotx-tanx) theses are due in the am. Fastness would be great?

  45. Geometry

    1.If two different lines are perpendicular to the same plane, they are: a. Collinear b. Coplanar c. Congruent d. Consecutive I think the answer is B, is that correct? Also, this: 2. Express 3 radical 75 plus radical 27 all over3 in radical form. I

  46. Math

    Find the domain of the following functions. 1. y= radical(x-3) - radical(x+3) 2. y= [radical(2x-9)] / 2x+9 3. y= radical(x^2 - 5x -14) 4. y= [cubed root(x-6)] / [radical(x^2 - x - 30)] I'm terrible at finding domains.. so any help with these problems would

  47. pre-calc

    is x=15 degrees a solution of radical 3/3 cos2x+sin2x=0

  48. Trig--check answer

    Solve the equation of the interval (0, 2pi) cosx=sinx I squared both sides to get :cos²x=sin²x Then using tri indentites I came up with cos²x=1-cos²x Ended up with 2cos²x=1 Would the answer be cos²x=1/2???

  49. trig

    write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x

  50. trig

    write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x

  51. trig

    cotx = -2 and 0 less than or equal to x less than or equal to pi Find sin2x and cos2x How to get the answers of sin2x = -4/5, cos2x = 3/5?

  52. trig

    Verify the trigonometric identity: [(1–sin²x)/sin²x]–[(csc²x–1)/cos²x]= -tan²x I can't figure this out.

  53. math

    sin2x − cos2x − tan2x = 2sin2x − 2sin4x − 1/ 1 − sin2x for x = 45

  54. Calculus

    Find the derivative of y with respect to x: y=(1+cos²x)^6 y'=6(1+cos²x)^5 How do you derive inside the brackets? The answer says -sin2x, but wouldn't it be -2sinx, using the chain rule.

  55. Math

    prove sin2x+cos2x+1 tan(pi/4+x) ______________ = __________ sin2x+cos2x-1 tanx so what I did tan(x) (1+cos(2x)+sin(2x)=tan(pi/4+x) (-1+cos(2x)+sin(2x)

  56. pre-cal

    find all solutions in interval [0,2pi] tan²x = -3/2 secx This question may look tricky, but its actually quite simple. First: rearrange the pythagorean identity tan²x+1=sin²x so that it reads tan²x=sin²x-1 Then replace the tan²x in the original

  57. Mathematical


  58. MATH

    Simplify: Sin2x/1-Cos2x

  59. physics

    1)if y=e^x . cot x then dy/dx will be 2) f(x)=sin²x-cos²x then the value of f' (π/4)

  60. maths


  61. precalc

    How do i verify: cotx = (sin2x)/(1-cos2x)

  62. Calculus

    How do you find the derivative of f(x)=sin2x/cos2x

  63. Maths

    if a=cos2x + sin2x and b=cos2y + isin2y.then find (a + b)

  64. calculus

    Solve for x on the interval (0, 2pi] (sin2x + cos2x)^2 = 1

  65. Math

    How do you prove this identity? cos2x*tan(π\4-x)= 1-sin2x

  66. pre-calc

    tanx= -12/5 x in Q 2. find sin2x= cos2x= tan2x=

  67. Math

    Required to Prove the following trig identity: (cos2x)^2 + (sin2x)^2 = 1

  68. gr 12. advanced functions

    Trig identity Prove: cos2x tan(pie/4 - x) ------- = 1 + sin2x

  69. Trig

    help please!: (sinx + sin2x +sin3x) / (cosx + cos2x + cos3x) = tan2x

  70. Algebra

    I'm adding 2(radical 50) + 12 (radical 8). I began by breaking the radical fifty into two parts: the radical of 25 and the radical of two. The radical of twenty five can break down into five, and the radical of two stays the way it is. Now it should read 2

  71. Calculus II

    How does one obtain cos2x = cos^2(x) - sin^2(x) by differentiating the identity sin2x = 2sinxcosx

  72. Precalculus

    Determine the solutions to the equation 2sinx − cos2x = sin2x for 0 ≤ x ≤ 2π . How do I start this question?

  73. Math (Trig)

    Rewrite the following expression in terms of tan3x: (sin2x + sin4x)/(cos2x + cos4x)

  74. math , help,algebra

    i am up to this point in my problem but i don't know what to do next with it can someone show me. Directions: Simplify by combining like terms x radical(18) minus 3radical(8x^2) these are the steps that i've done so far. = x radical (2*9) -3radical

  75. MATH

    veify that each equation is an identity cos2x+tan2xcos2x=1 sin4x-cos4x/sin2x=1-cot2x

  76. Math

    simplify (cos4x-cos2x)/(sin4x+sin2x) the answer choices are : cotx, tanx, cotxtanx, or 1

  77. Trigonometry

    How do I find all solutions in the interval [0,2Pi): sin2x=cos2x answer choices are: a.)Pi/8 b.) Pi/8, 5Pi/8, 9Pi/8, 13Pi/8

  78. math

    I have to find an exact solutions on the interval [0,pi) for both of these problems-- 1) 2sin2x = sqrtx and 2) 1-2sqrt2 sinxcosx = 0 I know this much: 1) sin2x = (sqrt x)/2 = 2sinxcosx = (sqrt x)/2 What do I need to do next? 2) 1/(2 sqrt2) = sinxcosx =

  79. Pre calc

    Please help me proof the identity. This isn't even math to me, I can not understand it so please show all work. God bless A)1-cos2x/sin2x=tanx B) sin4x/sinx=4cosxcos2x

  80. math,correction

    Simplify by combining like terms. Problem #32 radical (63) - 2 radical (28) + 5 radical (7) My answer: 4radical(7) Problem #50 Find the perimeter of the triangle shown in the figure. leg 1 = radical (5) - radical (3) leg 2= radical (5) + radical (3)

  81. Trigonometry

    I can't remember what formula to use for these. Note- the X's may be replaced by a theta symbol. I just didn't have one on my keyboard. Use the given information to find sin2X, cos2X and tan2X if 0< X

  82. maths please answer NOW!!!!!

    solve algebreically the equation cos2x=1-sinx also cosx=cosx-1 and please also sin2x=3sinx

  83. Calculus

    In the interval (0 is less than or equal to x which is less than or equal to 5), the graphs of y=cos(2x) and y=sin(3x) intersect four times. Let A, B, C, and D be the x-coordinates of these points so that 0

  84. trig

    Solve the triginometric equation analytically. Use values of x for 0 less then or equal to x less then 2pi The equation for this question is sin2x + cos2x = 0

  85. trig

    on the same set of axes: (0 degrees is greater than or equal to x and x is less than or equal to 360 degrees) (a) sketch the graphs of y= sin degrees ,y=2sinx degrees and y=sin2x degrees

  86. trigonometry

    Prove cotx-1/cotx+1=1-sin2x/cos2x

  87. math,correction

    Can somoene helpme plz... Simplify radical 7 * radical 14 wouldn't it be radical (7*14) = radical (98) = 7radical (14) = 7 radical (2) The result is right, you erred on the next to last line. So how do i show that step that i am wrong in...

  88. trig

    I keep trying to find the power reducing formula for sin^4(x), but I can't seem to get all the fractional parts correct. The answer I should be getting is: sin^4(x)=(1/8)cos4x-(1/2)cos2x+(3/8) I can only get this far knowing feeling confident. When I go

  89. math,correction

    Find the area of the rectangle shown in the figure. length = radical (3) + radical (5) width = radical (3) + radical (5) My answer: a= 8 + 2 radical (15) or a = 15.75 agree, you seem to be able to do these should i leave it as the radical form or the

  90. integral Calculus

    ʃ (4sin²x cos²×/sin2x cos2x)dx i've got it from the book and it has an answer from the back page of the book but i want to know how to solve it..i really need it for practicing this subject...please please help..Thanks a lot.. the answer is: -1/2

  91. Geometry, help!

    Circle O has a radius 28. Radii OM and ON form an angle of 60 degrees. Find MN. A) 28 radical 2 B) 28 C) 56 D) 56 radical 3 Is it A) ?

  92. math

    in the question 6radical x +3 radical y -2radical y +3 radical x -radical y is the answer 9 radical x +1 radical y. i just don't get it thanks

  93. math

    Solve radicals. 1. √8 /√32 (radical 8 divided by radical 32) = √1/√4 (divided numerator & denominator by 4) = 1/2 (simplify radical 1 over radical 4) 2. √7 /√49 (radical 7 divided by radical 49) = √7 /7 (simplified radical 49 = 7, but kept

  94. trig

    how does this work? (Sin2x+cos2x+2sin²x)/(sinx+cosx) = (sinx+cosx

  95. Math

    prove identity Sin2x - sinx/cosx + cos2x= sinx/cosx + 1

  96. trig

    Sketch the graph of f(x)=sin(x+30 degrees) and g(x)=cos2x in the same system of axis [-180 degrees;180 degrees]

  97. math,correction,plz

    Perform the indicated division. Rationalize the denominator if necessary. Then simplify each radical expression. Problem #54 (6-radical(20))/(2) My answer: 3-radical(5) Problem #50 Find the area of the rectangle shown in the figure. width = radical (3) +

  98. Pre-Calculus

    Hi, I need a bit of help with verifying identities. The problems are as follows: sinx+cosx/cotx+1=sinx sin2x/sin - cos2x/cosx=secx 1-tan^2θ/1+tan^2θ=cos2θ

  99. Precalculus

    Please help!!!!!!!!!!! Find all solutions to the equation in the interval [0,2π). 8. cos2x=cosx 10. 2cos^2x+cosx=cos2x Solve algebraically for exact solutions in the interval [0,2π). Use your grapher only to support your algebraic work. 24. cos2x+sinx=0

  100. algebra

    3 radical x - 4 radical y divided by 3 radical x - 2 radical y = ( i think im supposed to use the distributive property, after the conjugate. but didn't know if i could just cancel? thanks.


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