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In trigonometric function exercise 3.3 6th question |
| Answer» As we know Cos A × Cos B - Sin A × Sin B = Cos (A+B) Let π÷4-x = A and π÷4-y = BBy applying above formula , we getCos(π÷4 - x + π÷4 - y)By solving this,Cos[2π÷4 - (x+y)]= Cos[π÷2 - (x+y)]As Cos(π÷2 - theta) = Sin thetaBy applying this formula in our above equation , we get = Sin (x+y) | |