Basic trigonometric ratios will be defined using the right angled triangle ABC given below , to later on move to trigonometry formulas.
Trigonometric Ratios
Sin X = Opposite Side/ Hypotenuse
Cos X = Adjacent Side/ Hypotenuse
Sec X = 1/Cos X ; Csc X = 1/ Sin X; Tan X = Sin X/ Cos X; Cot X = Cos X/Sinx = 1/ Tan X
Trigonometric Formulas Sub topics
Pythagorean identities
Sin2X + Cos2 X = 1
Tan 2X + 1 = Sec2X
Cot2X + 1 = Csc2X
Even odd Identities
Sin (-X ) = -Sin X −> Same for Csc, Tan and Cot −> Odd functions
Cos (-X) = Cos (X) −> Same for Sec −> Even functions
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