Please help me w/ this problem ! It’s on the picture ! Please help me !
2 answers:
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Use the Pythagorean identity 
to simplify the numerator.
Now use that fact that
to set up the equivalent fraction:
Now reduce between the numerator and denominator to get -cos(x)
to simplify the numerator.
Now use that fact that
Now reduce between the numerator and denominator to get -cos(x)