# Solve for x: arccos(2x)+arccos(x)=pi?

• Solve for x: arccos(2x)+arccos(x)=pi?

Avoid squaring which often incurs the burden of extraneous roots. Let $\displaystyle \arccos x=\theta\ \ \ \ (1)\implies x=\cos\theta$ We have ...
Positive: 76 %
arccos(x), inverse cosine function. Definition, rules, graph and table.
Positive: 73 %

### More resources

$$x \arccos(x)+x/2=\cos(2x)$$ I dont know how to solve this one. It looks relatively easy but it is not, ... Solve $\arccos x\cdot\arcsin x={\pi^2\over 18}$ 1
Positive: 76 %
Inverse trigonometric functions ... arcsin(x), arccos ... but this convention logically conflicts with the common semantics for expressions like sin 2 (x ...
Positive: 71 %
Pi ableiten in einer Kurvendiskussion (2) ... und x=arccosy. und die (sin^2 x)+ ... arccos(x) ' = -1/ √(1-x^2) ...