D. यदि tan theta.tan 2 theta =1तो sin-2 theta+tan-2 theta का मान होगा-
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Answer:
tan2θtan4θ=1
We know, if tanA.tanB=1 then, A+B=90
∘
2θ+4θ=90
∘
6θ=90
∘
∴θ=15
∘
Hence, tan3θ=tan45
∘
=1
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