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Double Angle Formulas

Double Angle Formulas

Submitted by • July 14, 2012 www.tutorcircle.com

In mathematics, trigonometry shows the relationship between the angle and sides of a triangle. Here, we will see the double angle formulas. The double angle formula is given by:
?sin ?/ 2 = 2 sin ? cos ?
?cos 2 ? = cos2 ? – sin2?;
Cos 2 ? have three formulas which are as follows:
?cos 2 ? = cos2 ? – sin2?;
?cos 2 ? = 2 cos2 ? – 1; and
?cos ? = 1 – 2 sin2 ?;

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Voted by csjangir100

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