# Trig

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Prove that the equation is an identity:

cot4theta - csc4theta = -cot sq theta - csc sq theta

How ??

• Trig -

cot^4 - csc^4
= (cot^2 - csc^2)(cot^2 + csc^2)
= (-1)(cot^2 + csc^2)
= -cot^2 - csc^2

remember csc^2 = 1 + cot^2 ??

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