sinA * sinB = 1/2 * [cos(A - B) - cos(A + B)] This formula expresses the product of two sine functions in terms of the difference of two cosine functions. Specifically, sinA multiplied by sinB is equal to one-half times the difference between cos(A minus B) and cos(A plus B)...
Formula for 2SinASinB is written as the difference of thecos(A - B)andcos(A + B). Therefore, the trigonometric formula for 2SinASinB is given by, 2SinASinB = cos(A - B) - cos(A + B), for compound angles A + B and A - B. Using this formula, we have the formula for sin...