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Trigonometric Identities
Page 7
Questions (1,667)
If sinx=3/5,cosy=-12/13,where x and y both lie in 2nd quad.Find the value os sin(x+y).
4 answers
asked by
Anonymous
544 views
Claim: For all theta such that
-pie/2<theta<pie/2 the following holds true: (1+tan(theta))^2=1/cos(theta)
3 answers
asked by
Chay
400 views
How do I prove : 4sinAcosAcos2Asin15 all over. :sin2A(tan225-2sinsquared A)is equal to. :root 6 - root 2 over 2
4 answers
asked by
michelle
658 views
Prove that sin3theta=3sintheta-4sin^3theta
3 answers
asked by
chama
679 views
Prove the following trigonometric identities
(i)(1+cotx)^2 +(1-cotx)^2=2cosec^2x (ii)cos(270degrees+theta)/cos(360degrees -theta)
3 answers
asked by
tembo
1,345 views
sin(x) = 8/17 and 90 degrees < x < 180 degrees then find cos2(x)
3 answers
asked by
Harley
1,444 views
Simplify #1:
cscx(sin^2x+cos^2xtanx)/sinx+cosx = cscx((1)tanx)/sinx+cosx = cscxtanx/sinx+cosx Is the correct answer
3 answers
asked by
Anonymous
1,230 views
knowledge : point (-3,-4)is on the terminal arm of an angel (alpha) in stander position.verify that (sin alpha)2 + (cos alpha )2
3 answers
asked by
meme
792 views
solve cos 2x=secx for 0(<=)x<2pi using trigonometric identities.
4 answers
asked by
tatiana
752 views
show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin theta -1)
1 answer
asked by
victor2
421 views
use the fundamental trig. Identities to simplify tan^4x+2tan^2x+1
3 answers
asked by
denise
1,995 views
State the restrictions on the variables for these trigonometric identities.
a)(1 + 2 sin x cos x)/ (sin x + cos x) = sin x + cos
3 answers
asked by
Emily
817 views
Use the double angle formula to verify the identity cotxsin2x=1+cos2x
3 answers
asked by
SK
1,054 views
Prove cos4x = 8 cos^4x-8 cos^2x+1
3 answers
asked by
Dini
384 views
if tan(2x+18)degrees = cot(4x-12)degrees
3 answers
asked by
eve
1,034 views
Find the exact value of cos7(pi)/12 using sum and/or difference identities.
3 answers
asked by
Michael
569 views
complete the identity:
sec x - 1/sec x = ?
3 answers
asked by
Anonymous
336 views
Factor 1-sin^3x
3 answers
asked by
Sandra
367 views
Use a counter example to show that cos(x+y)= cosx +cosy is not an identity
3 answers
asked by
Brandon
848 views
sin^4 x = (3-4cos 2x + cos4x)/8
prove on one side please!
5 answers
asked by
Rachel
2,266 views
Prove the identity
sin(x+y+z)+sin(x+y-z)+sin(x-y+z)+ sin(x-y-z) = 4 sin(x)cos(y)cos(z) This identity is so long and after i tried
6 answers
asked by
Tommy
718 views
1. (sec^2x-6tanx+7/sec^2x-5)=(tanx-4/tanx+2)
2. (sin^3A+cos^3A/sinA+cosA)=1-sinAcosA 3. csc^6x-cot^6x+1+3csc^2xcot^2x please help
2 answers
asked by
George
647 views
prove that [(sin 2 t / sin t )] - [( cos 2t ) / cos t ] = sec t
and sin (2t - t ) = sin t
4 answers
asked by
Franco
991 views
Prove the identity
sin(3 pi /2 + x) + sin(3pi/2 -x) = -2cosx
3 answers
asked by
Rick
1,032 views
If secx = 8 and -pi/2 < x < 0, find the exact value of sin2x
Use the identity sin 2x = 2(sinx)(cosx) if secx = 8, then cosx = 1/8
3 answers
asked by
Ashley
1,041 views
1) Find the exact value. Use a sum or difference identity.
tan (-15 degrees) 2) Rewrite the following expression as a
3 answers
asked by
cheyanne
1,654 views
Prove the identity
(Sin²xcosx + cos³x) ÷ sinx = cotx
2 answers
asked anonymously
48 views
Prove the identity
Tan²x - sec²x + 2 = cosec²x - cot²x
2 answers
asked anonymously
38 views
Prove the identity
Cos⁴x + sin²x = sin⁴x + cos²x
2 answers
asked anonymously
56 views
Prove the identity
Cos²x - sin²x = 2cos²x - 1
2 answers
asked anonymously
51 views
Prove the identity
((Cos²x - sin²x) ÷ (cosx + sinx) ) + sinx
2 answers
asked anonymously
70 views
Prove the identity
(Cosxsinx) ÷ tanx = 1 - sin²x
2 answers
asked anonymously
45 views
given that tan 75 2+root3,without using a table or calculator, determine 5tan15 leaving your answer in the form a+b root c
2 answers
asked by
Sarang
41 views
Given that tan 75°=2+√3,without using a table or a calculator,determine 5tan15° leaving your answer in the form a+b√c
4 answers
asked anonymously
39 views
sinA.sin(B – C) + sinB.sin(C – A) + sinC.sin(A – B) = 0
2 answers
asked by
sinA.sin(B – C) + sinB.sin(C – A) + sinC.sin(A –B)
39 views
Suppose sin(4) -
Use the trig identity sin² (A) + cos2 (4) - 1 to find cos(4) in quadrant I. Show all steps and round to
2 answers
asked anonymously
65 views
Solve that cos2x +sin2x=1 using a right angles A
3 answers
asked by
Grace
19 views
(1+tan^2A)/(1+cot^2A)=((1-tanA)^2)/(1-cotA)^2
4 answers
asked by
purshotam
94 views
1. (sin θ - cos θ)^2
2. sec^2 θ - tan^2 θ - sin^2 θ Can you please show the step by step process of how to simply both?
2 answers
asked by
n
69 views
(2-cos2A)(1+2cot2A)=(2+cot2A)(2-sin2A)
1 answer
asked by
Santosh
94 views
rewrite cos(x- 5pi/3) in terms of sin(x) and cos(x)
1 answer
asked by
Rafi
62 views
If 𝑚 is in Quadrant I and tan2𝑚 = 24/7 then the value of tan𝑚 is:
2 answers
asked by
Anonymous
92 views
Find the value of:
(cos^4(75°) + sin^4(75°) + 3sin^2(75º)cos^2(75°)) / (cos^6(75º) + sin^6(75°) + 4sin^2(75°)cos^2 (75º))
4 answers
asked by
m
95 views
Prove that cos²theta + tantheta cosectheta=cos theta
1 answer
asked by
Tony
60 views
Given that sec theta - tan theta =1/4,find sec theta + tan theta
1 answer
asked by
Princess
70 views
If 1/sinA-1/cosA=-1/sinB-1/cosB , prove that cot((A+B)/2)=tanA.tanB
1 answer
asked by
Kishun
163 views
Calculate cos 37.5 using a half angle identity
2 answers
asked by
Alex
119 views
Prove this identity.
cos(3π/s +x) = sin x
2 answers
asked by
Amy
101 views
(1-tanx^2)/(1+tanx^2)=cos(2x)
1 answer
asked by
Anon
93 views
cosx+sinx/cosx-sinx = sec2x+tan2x
2 answers
asked by
Anon
137 views
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Parent Categories (14)
Algebra
Algebraic Simplification
Basic Trigonometric Functions
Calculus
Cosine and Sine
Functions
Functions and Formulas
Mathematics
Simplifying expressions
Tangent
Tangent Function
Trigonometric Equations
Trigonometric Functions
Trigonometry