Once Isabel rented the warehouse space, she decided to post ads on several social media sites to advertise her online bookstore.
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Answer:
Answer in the attachment, as it wasn't letting me answer it, saying rude words.
In order to prove
Let's write both sides in terms of only.
Let's start with the left hand side: we can use the formula for sum and subtraction of the sine to write
and
So, their multiplication is
So, the left hand side simplifies to
Now, on with the right hand side. We have
Now simply make this expression one fraction:
And as you can see, the two sides are equal.