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=2(cos15°+ sin15°) ^2
=2(cos^2 15°+sin^2 15°+2 sin 15°cos15°)
=2(1+sin30°)
=2(1+1/2)
=2(3/2)
=3
=2(cos^2 15°+sin^2 15°+2 sin 15°cos15°)
=2(1+sin30°)
=2(1+1/2)
=2(3/2)
=3
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