higher maths

What is the formula for cos(x+Y)?

what is 2sin30cos30 simplified?

Answers
cos(x+Y) = cos x cos Y - sin x sin Y
piperias
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
piperias
10 January 2012
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