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Popular >

cos(-pi(1))

Solution

cos (- π (1))

Solution

- 1

Solution steps

cos (- π (1))

= cos (- π 1)

Simplify

= cos (- π)

Use the following property:

cos (- x) = cos (x)

cos (- π) = cos (π)

= cos (π)

Use the following trivial identity:

cos (π) = (- 1)

cos (π)

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)

= - 1

Popular Examples

20 \cdot cos (4 0^{\circ})

-10cos(pi/6*39)+11

- 10 cos (\frac{π}{6} \cdot 39) + 11

cos (3 5^{\circ}) \cdot 420

100 cos (5 0^{\circ})

(sin (6))^{2}

Frequently Asked Questions (FAQ)

What is the value of cos(-pi(1)) ?
The value of cos(-pi(1)) is -1