Solution

prove

Solution

Solution steps
Manipulating right 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(α+β)+cos(α-β)=2cos(α)cos(β) ?

    The answer to whether cos(α+β)+cos(α-β)=2cos(α)cos(β) is True