What is the value of cos(arccos(-1/4))-2cos(2arccos(-1/4)) ?

The value of cos(arccos(-1/4))-2cos(2arccos(-1/4)) is 1.5

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cos(arccos(-1/4))-2cos(2arccos(-1/4))

cos (arccos (- \frac{1}{4})) - 2 cos (2 arccos (- \frac{1}{4}))

1.5

Solution steps

cos (arccos (- \frac{1}{4})) - 2 cos (2 arccos (- \frac{1}{4}))

Refine to a decimal form

= 1.5

\frac{1}{4} cos (0)

sin (\frac{2 π}{2}) + cos (\frac{2 π}{2})

cos (5.5)

- 51.875 cos (\frac{2 π}{365} (55 - 354)) + 727.725

(cot (1 0^{\circ}) - cot (8 0^{\circ})) tan (2 0^{\circ})

What is the value of cos(arccos(-1/4))-2cos(2arccos(-1/4)) ?
The value of cos(arccos(-1/4))-2cos(2arccos(-1/4)) is 1.5