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Verified answer
TriGonoMetRi2 cos 15 (sin 15 + cos 15) - 1
= 2 cos 15 sin 15 + 2cos² 15 - 1
= sin 2(15) + cos 2(15)
= sin 30 + cos 30
= 1/2 + 1/2 √3 ✔