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 1 : IT’S ALL ABOUT TRIGONOMETRY
 2 : TRIGONOMETRY FUNCTIONS
 3 : RECIPROCAL IDENTITIES ? sin(a) = I/cosec(a) ? cos(a) = 1/sec(a) ? tan(a) = 1/cot(a) = sin(a)/cos(a) ? cot(a) = 1/tan(a) = cos(a)/sin(a) ? sec(a) = 1/sec(a) ? cosec(a) = 1/cosec(a)
 4 : PYTHAGOREAN IDENTITIES sin2(a) + cos2(a) = 1 tan2 (a) + 1 = sec2(a) 1 + cot2(a) = cosec2(a)
 5 : ANGLE SUM AND DIFFERENCE TRIGONOMETRY FORMULAE sin(a + ß) = sin(a)cos(ß) + cos(a)sin(ß) sin(a – ß) = sin(a)cos(ß) – cos(a)sin(ß) cos(a + ß) = cos(a)cos(ß) – sin(a)sin(ß) cos(a – ß) = cos(a)cos(ß) + sin(a)sin(ß) tan(a + ß) = [tan(a) + tan(ß)] / [1 - tan(a)tan(ß)] tan(a – ß) = [tan(a) - tan(ß)] / [1 + tan(a)tan(ß)]
 6 : PRODUCTS AS SUM FORMULAE sin cos ß   =   ½[sin ( + ß) + sin ( - ß)] sin(a)cos(ß) = ½[sin(a + ß) + sin(a – ß)] cos(a)sin(ß) = ½[sin(a + ß) - sin(a – ß)] cos(a)cos(ß) = ½[cos(a + ß) + cos(a – ß)] sin(a)sin(ß) = -½[cos(a + ß) - cos(a – ß)]
 7 : DOUBLE ANGLE FORMULAE sin(2a) = 2sin(a)cos(a) cos(2a) = cos2(a) - sin2(a) = 1 - 2sin2(a) = 2cos2(a) - 1 tan(2a) = 2tan(a) / 1 - tan2(a)
 8 : HALF ANGLE FORMULAE
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