Lesson trigonometery fact to be known

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Cosē(x)+Sinē(x) = 1

1+tanē(x) = secē(x)

cotē(x)+1 = cosecē(x)

cos(2x) = 2cosē(x)-1 or 1-2sinē(x)

sin(2x) = 2sin(x)cos(x)

tan(x) = sin(x)/cos(x)

cot(x) = 1/tan(x)=cos(x)/sin(x)

sec(x) = 1/cos(x)

cosec(x) = 1/cos(x)

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