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Popular >

-cos(150)

Solution

- cos (15 0^{\circ})

Solution

\frac{3}{2}

+1

Decimal Notation

0.86602 \dots

Solution steps

- cos (15 0^{\circ})

Use the following trivial identity:

cos (15 0^{\circ}) = - \frac{3}{2}

cos (15 0^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= - \frac{3}{2}

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

Simplify

= \frac{3}{2}

Popular Examples

1 - \frac{1}{2} sin (2)

cos (5. 4^{\circ})

(0.1*10^{-9})/(sin(1.685))

\frac{0.1 \cdot 1 0 ^{- 9}}{sin ( 1.685 )}

2 \cdot sin (1 0^{\circ})

(sec(32)+csc(58))/(3csc(58)+sec(32))

\frac{sec ( 3 2 ^{\circ} ) + csc ( 5 8 ^{\circ} )}{3 csc ( 5 8 ^{\circ} ) + sec ( 3 2 ^{\circ} )}

Frequently Asked Questions (FAQ)

What is the value of -cos(150) ?
The value of -cos(150) is (sqrt(3))/2