what is the formula of sinA
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= sinA cosB + cosA sinB sin(A − B) = sinA cosB − cosA sinB cos(A + B) = cosA cosB − sinA sinB cos(A − B) = cosA cosB + sinA sinB sin2 A + cos2 A = 1, sin 2A = 2 sinA cosA cos 2A = 2 cos2 A − 1=1 − 2 sin2 A 2 sinA cosB = sin(A + B) + sin(A − B)
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Sin a = SinA is equal to the side opposite of the angle A (side a) divided by the hypotenuse of the triangle (side c).
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