SOLUTION: simplify tan^2\theta \x cos^2\theta -sin^2\theta

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Question 1201684: simplify tan^2\theta \x cos^2\theta -sin^2\theta
Answer by math_tutor2020(3817) About Me  (Show Source):
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Answer: 0

Work Shown:

tan%5E2%28theta%29+%2A+cos%5E2%28theta%29+-+sin%5E2%28theta%29







sin%5E2%28theta%29+-+sin%5E2%28theta%29

0

Therefore,
tan%5E2%28theta%29+%2A+cos%5E2%28theta%29+-+sin%5E2%28theta%29+=+0
is a trig identity.
It is true for all valid theta values in the domain.