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Popular >

2cos^2((5pi)/(12))-1

Solution

2 cos^{2} (\frac{5 π}{12}) - 1

Solution

- \frac{3}{2}

+1

Solution steps

2 cos^{2} (\frac{5 π}{12}) - 1

Rewrite using trig identities:

cos (\frac{5 π}{6})

= cos (\frac{5 π}{6})

Use the following trivial identity:

cos (\frac{5 π}{6}) = - \frac{3}{2}

= - \frac{3}{2}

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arctan((4sqrt(3))/(-4))

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tan(arcsin(5/9))

tan (arcsin (\frac{5}{9}))

Frequently Asked Questions (FAQ)

What is the value of 2cos^2((5pi)/(12))-1 ?
The value of 2cos^2((5pi)/(12))-1 is -(sqrt(3))/2