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# How to prove this identity

tan3x - tan2x- tanx = tan3xtan2xtanx

# verify identity

sin(X)sec(x)=1-(cos^2)x/sin(X)cos(X)

# Trig Identities

Prove 1 - sin2x / cosx = sin2x / 2sinx I tried do both LHS and RHS. Got stuck after a step or two.

# Verify the identity 1/tan(theta)csc(theta) = cos(theta)

This is for my trig class, and the directions say to verify the identity. Thanks so much.

# Use the sum or difference formulas to determine: A. sin105 degrees B. tan15 degrees

This is for my trig class. Thanks for the help!

# Trig Identities

Explain how you could determine the exact value of (sec 7pi/6) if you know the value of (sin 11pi/6). Prove with diagrams. I've no idea how to do this question that's worth 10 marks...

# Q2 POW #3 -Trig Identities

1) given the double angle identity for cosine: cos2θ=cos2θ-sin2θ      Prove: cos3θ = cos3θ - 3cosθsin2θ         and: cos4θ = cos4θ - 6cos2θsin2θ + sin2θ 2)...

# prove the following trigonometric identity

2sin^2x - 1÷ sinxcosx = tanx-cotx

# Solve the Trigonometry Identity

cosx = (1- tan^2 x/2)  /  1 + tan^2 x/2) Completely stuck.

# if (1-a^2)sin-2acos=0,prove a^2(1+cos)=1-cos

Prove a^2(1+cos)=1-cos if 1-a^2)sin - 2acos =0

# prove the trigonometric identity

(1-cos^2x)(cot^2+1) = 1

# Trig Identities

Prove sec2x = 1 + tan2x I did R.H.S = 1 + sin2x / cos2x = 1 + (1 - cos2x) / (1 - sin2x) = 1 + cot2x = ??? I think I'm doing it right,...

# Use the substitute x= tan y to show that

∫1       1     dx =¶  +  1 0  (1+x2)2         8      4

# Prove that 1 + sin b - cos b =2sin1/2b cos1/2b +sin1/2b

Prove that 1 +sin b -cos b=2sin 1 b cos 1 b +sin 1 b                                           ...

# What is the height of the building?

Jay is 120 meters from the base of a building and Mary is 40 meters from the base of the building. Jay's angle of elevation when looking at the top of the building is X and Mary's is 2X. What is the...

# Complete the identity: csc(t)(sin(t) + cos(t)) = ?

Complete the identity: csc(t)(sin(t) + cos(t)) = ?

# (sin^6 x)/(1- tan^2 x) + (cos^6 x)/(1- cot^2 x)

simplify simplify simplify simplify ...............

# use trigonometric identities to simplify the expression

sec^2(x)-sec^2(x) csc^2(x)

# prove identity

Secx-tanxsinx=1/secx