en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

cos((11pi)/2)

Solution

cos (\frac{11 π}{2})

Solution

0

Solution steps

cos (\frac{11 π}{2})

cos (\frac{11 π}{2}) = cos (\frac{3 π}{2})

= cos (\frac{3 π}{2})

Rewrite using trig identities:

cos (π) cos (\frac{π}{2}) - sin (π) sin (\frac{π}{2})

= cos (π) cos (\frac{π}{2}) - sin (π) sin (\frac{π}{2})

Use the following trivial identity:

cos (π) = (- 1)

Use the following trivial identity:

cos (\frac{π}{2}) = 0

Use the following trivial identity:

sin (π) = 0

Use the following trivial identity:

sin (\frac{π}{2}) = 1

= (- 1) \cdot 0 - 0 \cdot 1

Simplify

= 0

Popular Examples

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

cos((3pi)/4)-sin((3pi)/4)

cos (\frac{3 π}{4}) - sin (\frac{3 π}{4})

tan(arcsin(4/5)+arccos(1))

tan (arcsin (\frac{4}{5}) + arccos (1))

(2tan((7pi)/8))/(1-tan^2((7pi)/8))

\frac{2 tan ( \frac{7 π}{8} )}{1 - tan ^{2} ( \frac{7 π}{8} )}

sin (11 3^{\circ})

Frequently Asked Questions (FAQ)

What is the value of cos((11pi)/2) ?
The value of cos((11pi)/2) is 0