Prove that : Cos(3pi/4+x) + Cos(3pi/4-x) = √2cosx
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cos3pi/4cosx-sin3pi/4 sinx-cos3pi/4cosx-sin3pi/4sinx
Step-by-step explanation:
-2sin3π/4sinx
-2(-sinpπ/4)sinx
√2sinx
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