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Question

If tan2A=cot(A18), then value of A is ((A - 18) & 2A are acute angle)


A

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B

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C

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D

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Solution

The correct option is B


Given, tan2A=cot(A18)

tan2A=tan(90(A18)

tan2A=tan(108A)

2A=108A

3A=108

A=36


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