Recently published items

Given two side-lengths and an angle of a triangle, use the sine rule to calculate an unknown angle.

Simplifying the trigonometric expression $\frac{\sin^2(x)}{1\pm \cos(x)}$ using the trigonometric identity $\sin^2(x)+\cos^2(x)=1$.

Mean and median from a basic list of integers.

Calculate the magnitude of a 3-dimensional vector, where $\mathbf v$ is written in the form $\pmatrix{v_1\\v_2\\v_3}$.

Calculating the missing side-length of a triangle using the cosine rule.

Finding elements of a set. Requires knowledge of inequalities, notation for real, natural and integer and element of.

Calculate the magnitude of a 2-dimensional vector, where $\mathbf v$ is written in the form $\pmatrix{v1\\v2}$.

Solving $\sin(3x)=\sin(x)$ for $x\in \left(0,\frac{\pi}{2}\right)$.

One number as a percentage of another.  Biology context. Includes standard form.
Realistic values.

Given the ratio of copper to zinc in brass, calculate how much more copper than zinc is used to create a given amount of brass.

Used for chemistry/materials