Evaluate the integral I Step 1 15 sin x cos x dx Since 1 15 sin x cos x dx has an odd power of of cos x we will convert all but one power to sines We know that cos x 1 Step 2 Making this substitution using 1 gives us 1 sin x 15 sin x cos x dx 15 sin 15 sin x 1 sin x cos x dx 15 sin x cos x dx 155 SCC dx