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Popular >

cos(pi*1)

Solution

cos (π \cdot 1)

Solution

- 1

Solution steps

cos (π 1)

Simplify

= 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

\frac{sin ( 2 π )}{4}

\frac{sin ( 2 π )}{3}

cos(arctan(-5/12))

cos (arctan (- \frac{5}{12}))

arcsin (\frac{10}{15})

sin(pi/(18))cos((7pi)/(36))+cos(pi/(18))sin((7pi)/(36))

sin (\frac{π}{18}) cos (\frac{7 π}{36}) + cos (\frac{π}{18}) sin (\frac{7 π}{36})

Frequently Asked Questions (FAQ)

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