Qual o valor de ∫ sen 6x cos x dx ?

✂️ a) _ 7 cos 7x _ 5 cos 5x + c
2 2

✂️ b) 7 sen 7x + 5 sen 5x + c
2 2

✂️ c) sen7x + sen 5x + c
14 10

✂️ d) _ cos 7x _ cos 5x + c
14 10

✂️ e) 7 cos 7x + 5 cos 5x + c
2 2

Responda: Qual o valor de ∫ sen 6x cos x dx ?