simplify cos(90)-x

Solution

simplify

cos (9 0^{\circ}) - x

- x

Solution steps

cos (9 0^{\circ}) - x

Use the following trivial identity:

cos (9 0^{\circ}) = 0

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= 0 - x

0 - x = - x

= - x

5 x - [\frac{20}{25} + \frac{14}{28} + \frac{17.5}{35} + 2] x

x^{1} - x^{1} - 2 x

x^{2} + 7 6 x + 60

\frac{x}{134} \frac{y}{- 1201224}

(2^{3} a^{- 4} b^{5})^{- 2}