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Rumus Trigonometri
Rumus trigonometri dua sudut:
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sin (a+b) = sin a cos b + cos a sin b
sin (a-b) = sin a cos b - cos a sin b
cos (a+b) = cos a cos b - sin a sin b
cos (a-b) = cos a cos b + sin a sin b
sin(a+b)= sin a cos b + cos a sin b cos(a+b)= cos a cos b - sin a sin b
sin(a-b)= sin a cos b - cos a sin b cos(a-b)= cos a cos b + sin a sin b
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sin(a+b) + sin(a-b)= 2 sin a cos b cos(a+b) + cos(a-b)= 2 cos a cos b
sin a + sin b= 2 sin 1/2(a+b) cos 1/2(a-b) cos a + cos b= 2 cos 1/2(a+b) cos 1/2(a-b)
