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Popular >

1-cos^2((9pi)/8)

Solution

1 - cos^{2} (\frac{9 π}{8})

Solution

1 - \frac{2 + 2}{4}

+1

Solution steps

1 - cos^{2} (\frac{9 π}{8})

Rewrite using trig identities:

cos (\frac{9 π}{8}) = - \frac{2 + 2}{2}

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

Simplify

1 - (- \frac{2 + 2}{2})^{2} : 1 - \frac{2 + 2}{4}

= 1 - \frac{2 + 2}{4}

Popular Examples

tan(arccos(12/20))

tan (arccos (\frac{12}{20}))

sec^{2} (- 0.01)

6sin(pi/4)-cos(pi/4)

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

arccos(6/(sqrt(145)))

arccos (\frac{6}{145})

arccos(-(sqrt(2))/2)+arctan((sqrt(3))/3)

arccos (- \frac{2}{2}) + arctan (\frac{3}{3})

Frequently Asked Questions (FAQ)

What is the value of 1-cos^2((9pi)/8) ?
The value of 1-cos^2((9pi)/8) is 1-(2+sqrt(2))/4