What is the value of arccos(tan(pi/4)) ?

The value of arccos(tan(pi/4)) is 0

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arccos(tan(pi/4))

arccos (tan (\frac{π}{4}))

0

Solution steps

arccos (tan (\frac{π}{4}))

Use the following trivial identity:

tan (\frac{π}{4}) = 1

tan (\frac{π}{4})

tan (x)

periodicity table with

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

= arccos (1)

= arccos (1)

Use the following trivial identity:

arccos (1) = 0

arccos (1)

x - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arccos (x) π \frac{5 π}{6} \frac{3 π}{4} \frac{2 π}{3} \frac{π}{2} \frac{π}{3} \frac{π}{4} \frac{π}{6} 0 arccos (x) 18 0^{\circ} 15 0^{\circ} 13 5^{\circ} 12 0^{\circ} 9 0^{\circ} 6 0^{\circ} 4 5^{\circ} 3 0^{\circ} 0^{\circ}

= 0

= 0

arccos (\frac{1}{6})

e^{s i n (0)}

- sin (9 0^{\circ})

sin (2 \cdot \frac{π}{4})

arctan (1) - arctan (0)