if y= a(1 cos theta) and x=a(theta+sin theta) then find the value of dy/dx at theta =pie/2
![If sinθ1−cosθ+sinθ1+cosθ=4[0<θ<90],then the value of θ](https://meritnation-question-images.s3.ap-southeast-1.amazonaws.com/toppr_invalid/questions/1973505_1510216_ans_764187e2080542a8b24b5eb999cc7709.jpeg "If sinθ1−cosθ+sinθ1+cosθ=4[0<θ<90],then the value of θ")
If sinθ1−cosθ+sinθ1+cosθ=4[0<θ<90],then the value of θ
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