SOLUTION: Change all trigonometric functions in the expression to sines and cosines and simplify. cos(−x)/(sec x + tan(−x)) = Please explain Thank you

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Question 924671: Change all trigonometric functions in the expression to sines and cosines and simplify.
cos(−x)/(sec x + tan(−x)) =

Please explain
Thank you
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
You know the definitions. You just need to pay attention to the signs and use symmetry knowledge. Check the other two examples already answered.