SOLUTION: To which of the following expressions is the expression (1-cosθ)(1+cosθ) equivalent to? A. 1 B. sin^2θ C. csc^2θ D. cos^2θ E. sin^2θ

Question 1197788: To which of the following expressions is the expression (1-cosθ)(1+cosθ) equivalent to?
A. 1
B. sin^2θ
C. csc^2θ
D. cos^2θ
E. sin^2θ
Found 2 solutions by MathLover1, math_tutor2020:
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

=

= ..........using identity
=

answer:
note: you have two options, B and E, unless you made typo
whatever is is your answer

Answer by math_tutor2020(3817) (Show Source): You can put this solution on YOUR website!

Use the difference of squares rule, and pythagorean identity, to say

Therefore,

is an identity. It is a true equation for all real numbers theta.

You mention twice (choices B and E)

I have a feeling one of those is supposed to be , but I'm not 100% sure.

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