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Popular >

4cos(-pi/4)

Solution

4 cos (- \frac{π}{4})

Solution

22

+1

Solution steps

4 cos (- \frac{π}{4})

Rewrite using trig identities:

cos (- \frac{π}{4}) = \frac{2}{2}

= 4 \cdot \frac{2}{2}

Simplify

4 \cdot \frac{2}{2} : 22

= 22

Popular Examples

sin((4pi)/7)cos((5pi}{21})-cos((4pi)/7)sin(\frac{5pi)/(21))

sin (\frac{4 π}{7}) cos (\frac{5 π}{21}) - cos (\frac{4 π}{7}) sin (\frac{5 π}{21})

\frac{sin ( 3 )}{3}

tan (1.5)

cos^{5} (0)

sin((7pi)/6)-sin(pi/3)

sin (\frac{7 π}{6}) - sin (\frac{π}{3})

Frequently Asked Questions (FAQ)

What is the value of 4cos(-pi/4) ?
The value of 4cos(-pi/4) is 2sqrt(2)