sin x 4 = sin 75 9 sin x = 4 × sin 75 9 sin x = 0.429300. Do not round this answer yet. To calculate the angle use the inverse sin button on the calculator (sin x 1). x = 25.4 ∘ ...

Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with this BBC Bitesize GCSE Maths Eduqas guide.

According to textbooks, a sine wave is a wave whose form resembles a sine curve. Often in power electronics, we need a sine wave generator for some applications; a dc/ac power inverter, for example.

The new optical illusion, revealed in a paper by psychologist Kohske Takahashi of Chukyo University, is made up entirely of wavy lines, all with an identical sine curve.