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There are 6 basic trig identities :-

a) sine of θ = side opposite to angle / hypotenuse

b) cosine of θ = side adjacent to angle / hypotenuse

c) tangent of θ = side opposite to angle / side adjacent to angle

d) sec of θ = hypotenuse / side opposite to angle

e) cosec of θ = hypotenuse / side adjacent to angle

f) cotan of θ = side adjacent to angle / side opposite to angle