these are the identities i need
sinΘcosΘ=cosΘ
sec^4Θ-tan^4Θ=sec²Θcsc²Θ
(1+sec²Θ)/(1-secΘ)=(cosΘ-1)/(cosΘ)
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That depends on your profession. If you are a math teacher, then you might use a lot of Trig. If you are an engineer, working with forces on any object from different directions, then you would use trig. Electrical engineers use trig. Surveyors use trig.
Tangent, in geometry, is used to describe when figures have only one point in common. In Trig. tangent is applied to triangles.
Trig
90 degrees is one
Trig ratios or to give them their proper name are trigonometrical rations applicable to right angle triangles and they are tangent ratio, sine ratio and cosine ratio.