Question

(W) sina cosa(tana - cota) = 2 sin^2a - 1​

Answer 1

Answer:

Step-by-step explanation:

we know tana = sina/cosa  cota = cosa/sina

sina*tana*cosa - sina*cota*cosa = sin^2a - cos^2a   put cos^2a = 1 - sin^2a

which gives us 2sin^2a - 1

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