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Popular >

-cos(135)

Solution

- cos (13 5^{\circ})

Solution

\frac{2}{2}

+1

Decimal Notation

0.70710 \dots

Solution steps

- cos (13 5^{\circ})

Use the following trivial identity:

cos (13 5^{\circ}) = - \frac{2}{2}

cos (13 5^{\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{2}{2}

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

Simplify

= \frac{2}{2}

Popular Examples

cos (13 9^{\circ})

cosh(0.942)sin(0.429)

cosh (0.942) sin (0.429)

sqrt(2*9.81*3.5*(cos(90)-cos(50)))

2 \cdot 9.81 \cdot 3.5 \cdot (cos (9 0^{\circ}) - cos (5 0^{\circ}))

sin(45)-cos(60)

sin (4 5^{\circ}) - cos (6 0^{\circ})

- 40 sin (1) - 1

Frequently Asked Questions (FAQ)

What is the value of -cos(135) ?
The value of -cos(135) is (sqrt(2))/2