Question

Expand cos⁴a sin³a in terms
of sina ​

Answer 1

Step-by-step explanation:

cos⁴asin³a

(cos²a)²sin³a

(1-sin²a)²sin³a. (cos²a=1-sin²a)

(1+sin⁴a-2sin²a)sin³a. ( (a-b)²=a²+b²-2ab)

sin³a+sin^7a-2sin^5a