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Find the exact value (NO DECIMALS) of each expression by sketching a triangle:
(a) $\sin(\sin^{-1} \frac{1}{2}+\cos^{-1}\frac{1}{2}) =$ .
(b) $\cos(\sin^{-1} \frac{1}{2}+\cos^{-1}\frac{1}{2}) =$ .

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