What is the value of -(cos(0))/2 ?

The value of -(cos(0))/2 is -1/2

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-(cos(0))/2

- \frac{cos ( 0 )}{2}

- \frac{1}{2}

Decimal Notation

- 0.5

Solution steps

- \frac{cos ( 0 )}{2}

Use the following trivial identity:

cos (0) = 1

cos (0)

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= 1

= - \frac{1}{2}

\frac{2}{π} \cdot (- cos (20 0^{\circ}) + cos (2 0^{\circ}))

10 sin (22 5^{\circ})

(- 31. 4^{2} \cdot 5) \cdot sin (31.4 \cdot 2 - 2 \cdot 0 + π)

- 14.5 cos (\frac{π}{8} \cdot 60) + 15.5

15 tan (1 8^{\circ})