SOLUTION: Using trig identities simplify {{{cos(-x)-sin(-x)}}}

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Question 1121811: Using trig identities simplify cos%28-x%29-sin%28-x%29
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
These would be in your interest to know or be able to recognize:

cos%28-x%29=cos%28x%29
and
sin%28-x%29=-sin%28x%29