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This is the answer for apex!!!
Answer: 214 You added up all of those and devided the mean( all 4)
I doubt the options you've mentioned here.
The correct answer should be x=a/b
Answer:

Step-by-step explanation:

Combine like terms:

Multiply both sides by -10:

Answer:
We know
sin (A + B) = sin A cos B + cos A sin B
sin (A - B) = sin A cos B - cos A sin B
(A + B) + sin (A - B)
= sin A cos B + cos A sin B + sin A cos B - cos A sin B
= sin A cos B + sin A cos B
= 2 sin A cos B