What is the value of 20cos(0) ?

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20cos(0)

20 cos (0)

20

Solution steps

20 cos (0)

Use the following trivial identity:

cos (0) = 1

cos (0)

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}

= 1

= 20 \cdot 1

Simplify

= 20

cos (200 π)

arcsin (sin (\frac{17 π}{6}))

cos^{2} (\frac{5 π}{4})

3 tan (4 5^{\circ}) + csc (3 0^{\circ}) cos (6 0^{\circ})

\frac{sin ( 4 7 ^{\circ} ) + cos ( 1 7 ^{\circ} )}{cos ( 4 7 ^{\circ} ) + sin ( 1 7 ^{\circ} )}