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Trigonometric graphs can be sketched when you know the amplitude, period, phase and maximum and minimum turning points.

Trigonometric functions can have several solutions. Sine, cosine and tangent all have different positive or negative values depending on what quadrant they are in.

Trigonometry can be used to find the area of a triangle when you know the length of two sides and the included angle.

The sine rule can be used to find an angle from 3 sides and an angle, or a side from 3 angles and a side. The cosine rule can find a side from 2 sides and the included angle, or an angle from 3 sides.

Bearings are angles used in navigation. They are based on moving clockwise from due north. Missing information about bearings can be worked out using the sine and cosine rules.