Multiple choice general knowledge sin2x= 2 sinx cosx sinx cosx (1/2) cosx sinx 1/(sinx cosx) Reveal answer Fill a bubble to check yourself A Correct answer Explanation The double-angle formula for sine is sin 2x = 2 sin x cos x. This identity can be derived from the sine addition formula sin(x+x) = sin x cos x + cos x sin x. Option B is missing the factor of 2, and the other options are incorrect.