Answer:
U were correct. k = 2
Step-by-step explanation:
-9k - 6k = -30
group all ks
-15k = -30
divide by -15
k = 2
1
cos 2x + 2 sin²x
= (1 - 2 sin²x) + 2 sin²x
= 1 - 2 sin²x + 2 sin²x
= 1