What is the value of 1-cos((3pi)/4) ?

The value of 1-cos((3pi)/4) is 1+(sqrt(2))/2

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1-cos((3pi)/4)

1 - cos (\frac{3 π}{4})

1 + \frac{2}{2}

Decimal Notation

1.70710 \dots

Solution steps

1 - cos (\frac{3 π}{4})

Use the following trivial identity:

cos (\frac{3 π}{4}) = - \frac{2}{2}

cos (\frac{3 π}{4})

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}

= - \frac{2}{2}

= 1 - (- \frac{2}{2})

Simplify

= 1 + \frac{2}{2}

sin (21 7^{\circ})

\frac{sin ( 12 0 ^{\circ} )}{tan ( 4 5 ^{\circ} ) + sin ( 21 0 ^{\circ} ) cos ( 30 0 ^{\circ} )}

arccos (- \frac{1}{8})

10.3 sin (3 7^{\circ})

2 sin^{2} (\frac{3 π}{2})

What is the value of 1-cos((3pi)/4) ?
The value of 1-cos((3pi)/4) is 1+(sqrt(2))/2