# Determine the value of cos (-53pi/12) using a double or half angle formula.?

• Determine the value of cos (-53pi/12) using a double or half angle formula.?

Double-Angle and Half-Angle formulas are very useful. For example, ... Using the Double-Angle formulas we get Putting stuff together we get
Positive: 69 %
The double and half angle formulas can be used to find the values of ... but by using the half angle formula for ... (\sin^2+\cos^2=1\). Half Angle ...
Positive: 66 %

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How to use the formula to find the exact value of tigonometric functions ... Double Angle Formula ... The double angle identities take two different formulas
Positive: 69 %
Section 7.3 Double-Angle,Half ... Solution: Using one of the double-angle ... Another way to obtain this identity is to use the double-angle formula ...
Positive: 64 %
Cosine of a Double Angle. Using a similar process, we obtain the cosine of a double angle formula: cos 2α = cos 2 α − sin 2 α. Proof. This time we ...