Solution

prove

Solution

Solution steps
Manipulating left side
Use the negative angle identity:
Use the negative angle identity:
Simplify
We showed that the two sides could take the same form

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Frequently Asked Questions (FAQ)

  • Is cos(-x)-sin(-x)=cos(x)+sin(x) ?

    The answer to whether cos(-x)-sin(-x)=cos(x)+sin(x) is True