# Double Angle Formulas

### Question 1

1 point

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End of Lesson

Double Angle Formula for Sine Double Angle Formula for Cosine Double Angle Formula for Tangent
$\sin(2A) = 2\sin(A)\cos(A)$     $\cos(2A) = \cos^2(A)-\sin^2(A) \\ \cos(2A)=1-2\sin^2(A) \\ \cos(2A)=2\cos^2(A)-1$     $\tan(2A) = \dfrac{2\tan(A)}{1-\tan^2(A)}$

Double Angle Formulas Slides (PDF)