Bengali] Simplify: (i) (cos theta)/(sin (90^@ + theta)) + (sin (-th

Simplify: (i) (cos theta)/(sin (90^@ + theta)) + (sin (-theta))/(sin(180^(@) + theta)) - (tan(90^(@)+theta))/(cot theta)

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Bengali] Prove that (cos(90^0+theta)sec(theta)tan(180^0+theta))/(se

Evaluate sin theta*cos theta-((sin theta*cos(90-theta)*cos theta

Given that cos (2x+15) =sin (x-30), 0≤x≤90, what is the value of

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Prove that `(costheta)/sin(90^@+theta)+(sin(-theta))/sin(180^@+

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