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Popular >

2cos^2(30)-1

Solution

2 cos^{2} (3 0^{\circ}) - 1

Solution

\frac{1}{2}

+1

Solution steps

2 cos^{2} (3 0^{\circ}) - 1

Use the following trivial identity:

cos (3 0^{\circ}) = \frac{3}{2}

= 2 (\frac{3}{2})^{2} - 1

Simplify

2 (\frac{3}{2})^{2} - 1 : \frac{1}{2}

= \frac{1}{2}

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- 2 cos (3 \cdot \frac{π}{6})

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Frequently Asked Questions (FAQ)

What is the value of 2cos^2(30)-1 ?
The value of 2cos^2(30)-1 is 1/2