Proov that - cos ²x + cos ²(x+π/3) + cos²( x- π /3)=3/2

1.	Proov that - cos ²x + cos ²(x+π/3) + cos²( x- π /3)=3/2
Answer» Its example of ncert ....u can understand from there only ....misc last example.... Here, put cos^2x=1+cos2x/2

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