Question

Solve for x. cos(6x) = sin(3x - 9) A. x = 10 B. x = 11 C. x = -10 D. x = 12

Answer 1

Answer:

B

Step-by-step explanation:

cos(6x)= sin (3x-9)

sin(90-6x)=sin(3x-9). ; (As cos A = sin (90-A))

90-6x=3x-9

99=9x

x=99/9 = 11