Múltiple choice
Use the product to sum formula to rewrite the expression as asum or difference: cos6xsin7x
a. (Sin 13x - cos x)/ 2
b. (Sin 13x + cos 13x)/ 2
c. (Sin 13x - sin x)/ 2
d. (Sin 13x - sin (-x)) / 2
没有找到相关结果
