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Popular >

2cos^2(pi/3)-1

Solution

2 cos^{2} (\frac{π}{3}) - 1

Solution

- \frac{1}{2}

+1

Solution steps

2 cos^{2} (\frac{π}{3}) - 1

Use the following trivial identity:

cos (\frac{π}{3}) = \frac{1}{2}

= 2 (\frac{1}{2})^{2} - 1

Simplify

2 (\frac{1}{2})^{2} - 1 : - \frac{1}{2}

= - \frac{1}{2}

Popular Examples

- cot (\frac{3 π}{4})

cos((5pi)/4-(5pi)/6)

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3 cos (3 π)

sin (2 \cdot 50)

\frac{10}{sin ( 3 0 ^{\circ} )}

Frequently Asked Questions (FAQ)

What is the value of 2cos^2(pi/3)-1 ?
The value of 2cos^2(pi/3)-1 is -1/2