This week I learnt about what cosine sine and tangents were. Before now, they used to just be mystery buttons on my calculator. I’ve now figured out you can use them to calculate angles and sides on a triangle. I’ve also learnt that they all have a negative version of themself which you use when you move it to the opposite side of the equation.

Here’s an example:

cos x = \frac{12}{45}


x = cos^{-1} \frac{12}{45}


x = 74.5

When you make cosine, sine and tangent negative, they are called inverse cosine, sine and tangent, and not actually called negative.