Question: cos &- sin a 4. Prove cos 8+ sin e = sec 20-tan 20. 5. If sinx + cos x = k, for what value(s)

cos &- sin a 4. Prove cos 8+ sin e = sec 20-tan
cos &- sin a 4. Prove cos 8+ sin e = sec 20-tan 20. 5. If sinx + cos x = k, for what value(s) of k does sinx cosx = 1?v vv

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