Solving Trigonometic Equations

Question

solve for x and give the answers as a equations : ( by radian)

1)cos(sinx)=1

<<<and thanks >>>

We know sin 2x = 2(sinx)(cosx)
so (sinx)(cos)=1/2(sin 2x)

So we can change your equation from

(sinx)(cosx)=1 to
1/2(sin 2x) = 1
(sin 2x) = 2

But the sine value of any angle is between -1 and 1, so your equation has no real solution.

Thanks