1.

3. tan 20° cot 70° – sec 20° cosec 70​

Answer»

TAN 20°× cot 70° - sec20°×cosec 70°

=tan 20°×cot(90°-20°)-sec 20°×cosec(90°-20°)

=tan 20°× tan 20°-sec 20°× sec 20°

=tan^2 20°-sec^2 20°

=-(sec^2 20°- tan^2 20°)

=-1

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