Solution

prove

Solution

Solution steps
Manipulating left side
Rewrite using trig identities
We showed that the two sides could take the same form

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Frequently Asked Questions (FAQ)

  • Is cos(2x-x)-2sin(x)sin(2x)=cos(3x) ?

    The answer to whether cos(2x-x)-2sin(x)sin(2x)=cos(3x) is True