Answer:
a is write, b is wrong
Step-by-step explanation:
b) difference is subtraction!
The question asks "the sine of a difference of two real numbers is not necessarily equal to the difference of the sines
So the first part is "the sine of a difference of two real numbers" would be writtten as : sin (x-y)
The second part, the difference of the sines, would be: sinx - siny
