find th value of x cosec(90+thetha) +x costhta cot(90+thetha)=sin (90+thetha)
Instead of theta, we are using A.
cosec (90� + A) + x cos A cot (90� + A) = sin (90� + A)
? 1 + x cos A cos (90� + A) = sin2 (90� + A)
? 1 � x cos A sin A = cos2 A [cos (90� + A) = � sin A]
? 1 � cos2 A = x cos A sin A
? sin2 A = x cos A sin A
? sin A ( x cos A � sin A) = 0
? x = tan A (If sin A ? 0)