Question

integration of cos2x-cos2y/cosx-cosy​

Answer 1

Answer:

(Cos2x-cos2y) /(cosx-cosy)

= 2sin(x+y) sin(x-y) /2sin(x+Y) /2.sin(y-x) /2

={4sin(x+y) /2.cos(x+y ) /2.sin(y-x)/2.cos(y-x)/2}/

Sin(x+y) /2.cos(y-x) /2

= 4cos (x+y) /2.cos(y-x) /2 (answer)

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