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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^(@)`

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Verified by Experts

The correct Answer is:
(a) `-(1)/(2)` (b) `(sqrt(5)+1)/(8)`
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