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Reciprocal trig functions
Original function Equivalent function
Sin2 + cos 2=1 1+cot2 = cosec 2
Sin2 + cos 2=1 Tan2 +1 =sec 2
Cosec 1/sin
Sec 1/cos
cot 1/tan OR cos/sin
Coumpound angle
Sin(±) * Sincos ± sincos
Cos(±) * Coscos - sinsin
Tan(+) Tan + tan/1- tantan

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cos1- 2/2
*In formula book
When angle is very small


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