Simplify cos-cos - - - - sin-sin- - -

Use the formula #160; #160; cos(A+B)=cos Acos B sin Asin B Now, cosαcos ( γ α #160; ) sinαsin ( γ α #160; ) =cos ( α +γ α #160; ) ...

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Cos(A+B)Cos(A-B)

Simplify co...

Question

Simplify $cos α cos (γ - α) - sin α sin (γ - α)$

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