Asked by Don
Prove that the equation is an identity:
cot4theta - csc4theta = -cot sq theta - csc sq theta
How ??
cot4theta - csc4theta = -cot sq theta - csc sq theta
How ??
Answers
Answered by
Steve
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 ??
= (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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