What is the value of cos(((3pi))/4) ?

The value of cos(((3pi))/4) is -(sqrt(2))/2

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Find the Exact Value cos((3pi)/4)

cos (\frac{( 3 π )}{4})

- \frac{2}{2}

Solution steps

cos (\frac{( 3 π )}{4})

= cos (\frac{3 π}{4})

Use the following trivial identity:

cos (\frac{3 π}{4}) = - \frac{2}{2}

= - \frac{2}{2}

sec (\frac{( 5 π )}{6})

tan (θ) = \frac{- 4}{5}

sec (\frac{( 5 π )}{3})

sin (x) = \frac{18.5}{20}

sec (\frac{( 2 π )}{3})

What is the value of cos(((3pi))/4) ?
The value of cos(((3pi))/4) is -(sqrt(2))/2