a) 2 sin"(\\pi\/12)" cos "(\\pi\/12)" =sin "(\\pi\/6)"=0.5
b) 2 sin 45°cos 45° = sin 90°= 1
c) 2 tan 60°cos2 60° = 2 (sin 60°/cos 60°) cos2 60° = 2 sin 60° cos 60°= sin 120° = "\\sqrt{3}\/2 = 0.866"
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