TRIG

posted by .

find:


sin 23pi/12


i got totally the wrong answer how do i approach this?

  • TRIG -

    That is pi/12 less than 2 pi (360 degrees), which would be 345 or -15 degrees. The sin of that angle is -0.2588

    If you don't want the decimal approximation, it is

    -sin(45 - 30) = -sin 45 cos 30 + sin 30 cos 45 = (sqrt 2)/2*[1/2 - (sqrt3)/2]
    = (sqrt2)/4 -(sqrt6)/4

  • TRIG -

    haha i got that too! but the right answer is

    (-root(2-root(3)))/2

  • TRIG -

    why don't you evaluate your "right" answer and compare it with drwls answer ?

    MMMhhh ??

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. trig integration

    s- integral endpoints are 0 and pi/2 i need to find the integral of sin^2 (2x) dx. i know that the answer is pi/4, but im not sure how to get to it. i know: s sin^2(2x)dx= 1/2 [1-cos (4x)] dx, but then i'm confused. The indefinite …
  2. Calculus

    Consider the function f(x)=sin(1/x) Find a sequence of x-values that approach 0 such that sin (1/x)=0 sin (1/x)=1 sin (1/x)=-1 Is sin sin (1/x)=0 and sin (1/x)=-1 does not exist. What is sin (1/x)=1 then.
  3. TRIG!

    Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6 x=1 - (3/4)sin^2 2x work on one side only! Responses Trig please help! - Reiny, Monday, February 23, 2009 at 4:27pm LS looks like the sum of cubes sin^6 x + cos^6 …
  4. Algebra II/ Trig

    Should the triangle be solved beginning with Laws of Sines or Laws of Cosines. Then solve the triangle and round to the nearest tenth. a=16, b=13, c=10 I got this answer but it is wrong and don't understand where I made the mistake. …
  5. Trig

    Find the exact circular function value for: sec(23pi/6) I know the answer should be: [2sqrt(3)]/3, but I do not understand how to solve the problem. I have a unit circle, but 23pi/6 is not on it, so I don't know how to find the (x,y)
  6. TRIG MATH

    If sin theta= -7/8, then the value of 1/cot theta in the interval 3pi/2<theta is?
  7. Trig

    Find cos(s+t) if cos s= -1/2 and sin t= 3/5, s and t are in quadrant II. I got the answer to be -4/10 plus -3sqrt(3)/10. Is that right?
  8. trig

    find exact value of cos(23pi/6)
  9. pre calc trig check my work please

    sin x + cos x -------------- = ? sin x sin x cos x ----- + ----- = sin x sin x cos x/sin x = cot x this is what i got, the problem is we have a match the expression to the equation work sheet and this is not one of the answers. need
  10. Math

    Evaluate the integral of (e^2x)*sin^3 x dx I let u = e^2x, du = (1/2)e^2x dx v= (-1/3)cos^3 x , dv =sin^3 x dx When I used integration by parts and solved it all out I got: (37/36)intgral of (e^2x)*sin^3 x dx = (-1/3)(e^2x)*cos^3 x …

More Similar Questions