Evaluate: `int(cosx)/(cos3x)dx`

Explanation

We have given,



`implies int frac{cos x}{cos 3 x} dx`

`=int frac{cos x}{4 cos ^{2} x-3 cos x} d x `

`=int frac{1}{4 cos ^{2} x-3} d x`

Now on dividing the numerator and denominator b y
` cos ^{2}x`

...