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Find the value of (a) sin(pi)/(10)+sin...

Find the value of
(a) `sin(pi)/(10)+sin(13pi)/(10)` (b) `cos^(2)48^(@)=sin^(2) 12^(@)`

Text Solution

Verified by Experts

a) `-1/2` , b) `(sqrt(5)+1)/8`
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Knowledge Check

  • sinpi/10+sin(13pi)/(10)=?

    A
    1
    B
    `1/2`
    C
    `-1/2`
    D
    None of these

  • The value of cos^(2)48^(@)-sin^(2)12^(@) is

    A
    `(sqrt(5)+1)/(8)`
    B
    `(sqrt(5)-1)/(8)`
    C
    `(sqrt(5)+1)/(5)`
    D
    `(sqrt(5)+1)/(2sqrt(2))`

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