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cos(x+Y) = cos x cos Y - sin x sin Y

10 January 2012

2sin30cos30 = sin 60°= sin (30°+30°)
= sin 30° cos 30° + cos 30° sin 30°
= 2 sin 30° cos 30°
= 2 (1/2) ((√3)/2)
= (√3)/2

10 January 2012

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