The double angle formula for the sine is
The right hand side is exactly your expression, where
So, rewriting the expression from right to left, we have
Practice with proofs on aleks?
1 answer:
You might be interested in
Answer:
C
Step-by-step explanation:
We have:
Where a<0.
We would like to solve for a. So, let’s divide both sides by a.
Notice that a<0. Therefore, a is negative. Hence, we must flip the sign since we are dividing by a negative. This yields:
Now, we will subtract b from both sides. Therefore, our inequality is:
Hence, our answer is C.