Question

simplify sin^a sin^b + sin^2a cos^2 b + cos^2 sin^2b cos^2a cos^2b + 3 cosec^4 a - 3 cot ^4 a - 6 cot^a

Answer 1

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Taking A as centre, draw a circle of radius 4 cm and taking B

Construct tangents to each circle from the centre of the other circle.