tan square theta*
cos square theta is equal to 1 - cos square theta
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LHS- tan²theta * cos²theta
= sin²theta/cos²theta * cos²theta
= sin²theta
= 1-cos²theta. (sin²theta + cos²theta= 1)
= sin²theta/cos²theta * cos²theta
= sin²theta
= 1-cos²theta. (sin²theta + cos²theta= 1)
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