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

The value of -cos(pi/2)-cos(0) is -1

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-cos(pi/2)-cos(0)

- cos (\frac{π}{2}) - cos (0)

- 1

Solution steps

- cos (\frac{π}{2}) - cos (0)

Use the following trivial identity:

cos (\frac{π}{2}) = 0

Use the following trivial identity:

cos (0) = 1

= - 0 - 1

Simplify

= - 1

\frac{18}{tan ( 4 1 ^{\circ} )}

arctan (\frac{4}{24})

4 (cos (\frac{7 π}{4}) + i sin (\frac{7 π}{4}))

cos (5 π) + i sin (5 π)

\frac{sin ( 15 0 ^{\circ} ) + cot ( 31 5 ^{\circ} )}{3 cos ( 21 0 ^{\circ} )}