Evaluate the following:tan 90° A cot A/cosec2A cos2A

Evaluate the following:tan 90° A cot A/cosec2A cos2A
Evaluate the following-tan 90-A cot A-cosec2A-cos2A

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What is the value of [tan^2 (90 - theta) - sin^2 (90 - theta)] cosec^2

yut using trigonometric tables, evaluate the following ( 4 to 7

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Prove the following: (tan(90^0-A)cotA)/(cos e c^2A)-cos^2A=0

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Prove that dfrac{1+tan^2(45^o-A)}{1-tan^2(45^o-A)}=cosec 2A.

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prove the following: tan(90 - A)cot A /cosec2 A - cos2 A = 0