Answer :

We are given that,

4 cos-1 x + sin-1 x = π …(i)


We need to find the value of x.


Using the property of inverse trigonometry,




Replacing θ by x, we get



Substituting the value of sin-1 x in (i),


4 cos-1 x + sin-1 x = π








Taking cosines on both sides,




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