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Question

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It tanθ+cotθ=2, find the value of tan2θ+cot2θ.

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Solution

tanθ+cotθ=2

Squaring both sides,

(tanθ+cotθ)2=22

tan2θ+cot2θ+2tanθcotθ=4

tan2θ+cot2θ=42×tanθ×1tanθ

[cotθ=1tanθ]

tan2θ+cot2θ=2

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