'Sin 2a' presentation slideshows

Aim: How do we find the trig values of double angles?

The sine of the Sum of 2 Angles:. sin (A + B) = sin A cos B + cos A sin B. Aim: How do we find the trig values of double angles?. Do Now:. Use. to prove sin 2A = 2 sin A cos A. Sine of Double Angles. sin 2A = 2 sin A cos A. sin (A + B) = sin A cos B + cos A sin B. sin 2A = sin(A + A).

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Use Addition Formulae to get the Double Angle Formulae

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