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सिद्ध कीजिएः a. cos x+""^(n)C(1)cos2x+...

सिद्ध कीजिएः
`a. cos x+""^(n)C_(1)cos2x+""^(n)C_(2)cos3x+…….+""^(n)C_(n)cos(n+1)x=2^(n)."cos"^(n)x/2.cos((n+2)/2)x`
b. `sinx+""^(n)C_(1)sin2x+""^(n)C_(2)sin3x+……………..+""^(n)C_(n)sin(n+1)x=2^(n)."cos"^(n)x/2.sin((n+2)/2)x`

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