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(a)Derive geometrically that cos(x+y)=co...

(a)Derive geometrically that `cos(x+y)=cos x cos y-sin x sin y`.Hence deduce the valueof `cos 75^@`

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Knowledge Check

  • If y = cos(log sin x), then dy/dx =

    A
    (-sin (log sin x))
    B
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    C
    `a^(2)+b^(2)`
    D
    `sqrt(a^(2)+b^(2))`

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