Answer: D
Step-by-step explanation:
Answer:
I'm sorry for answering like that, so here is my actual answer: It is the third one. Again I'm very sorry.
Step-by-step explanation:
Combine like terms
-2x-4=-2x-4
Since the equations are the same, the answer is infinitely many solutions.
LHS: =

(using

)
We know

so we can replace the sin²x in the LHS expression as follows

which is the RHS.