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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