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siny -2 sin' y 4. Prove = tany .vvv 2 cos3 y-cosy 5. If sinx + cos x = k, for what value(s) of k

siny -2 sin' y 4. Prove = tany .vvv 2 cos3 y-cosy 5. If sinx + cos x = k, for what value(s) of k does sinxcosx = 1?vVv

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