Question

In a right triangle, cos∘ (x) ∘= sin∘ (7x+9)∘ . Solve for x. Round your answer to the nearest hundredth if necessary.

Answer 1

Answer: 10.13

Explanation:

Assuming this in deg,
cos(x)=sin(90-x) so,
sin(90-x)=sin(7x+9)
90-x=7x+9
8x=81
x=81/8
x=10.125 rounded to the nearest hundredth is
10.13