sec(x)=1/cos(x) - (hint: look at the third letter: sec->(1/)cos,
cosec->(1/)sin, cot->(1/)tan)
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The six basic functions of trigonometry are the sine, cosine, tangent, cosecant, secant, and cotangent functions. Abbreviated sin, cos, tan, csc, sec, cot.
Thales
It depends what you need to calculate. There are various formulas for this. It is a branch of mathematics called trigonometry.
With a protractor or use trigonometry if you know its dimensions
trigonometry is often used to calculate distances from certain locations