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Trigonometric Identities, Quotient Identities, Reciprocal Identities, Pythagorean Identities, 1, cot e =, sin e, tan 6 =, sin? 0+ cos? 0 =1, tan e, cos 0, 1, csc 0 =, sin e, tan? 0+1= sec? e, cos e, cot 0 =., sin 0, 1+cot? 0 = csc? 0, 1, sece =, cos e, Sum Identities, Difference Identities, Double Angle Formulas, Addition Formulas, Subtraction Formulas, sin 2a = 2 sin a cos a, sin(a+b) = sin a cosb+cos asin b sin(a-b) = sin acosb-cos asin b, cos(a+b) = cos acos b-sin asin b cos(a-b) = cos a cos b+sin asin b, cos 2a = cos a-sin² a, = 2 cos a-1, tan a+ tan b, tan a- tan b, =1-2 sin? a, tan(a+b)=, tan(a-b) =:, 1- tan a tan b, 1+ tan a tan b, 2 tan a, tan 2a =, 1-tan a, Co-function Identities, Even-Odd Identities, Half-Angle Formulas, -0 = sin 0, sin (-0) = - sin 0, 1-cos 0, cos, sin, cos (-0) = cos 0, in-- coso, -0= cose, 1+cos 0, tan (-0) = -, tan 0, cos, 2, cot -0 = tan e, csc(-0)=-, csc e, 1- cos 0, tan, 0|= cot 0, sec (-0) = sec0, sin 0, tan, sin 0, cot (-0)=-cot0, csc --0 |= sece, 1+ cos e, cos e, sec, -0 = csce, =±., Sum-to-Product Formulas, Product-to-Sum Formulas, a+b, a -b, cos, sin asin b =[cos(a-b)-cos(a+b)], sin a + sin b = 2 sin, 2, 2, a-b, a+b, cos, 2, [cos(a-b)+ cos(a +b)], cos a cos b =., sin a – sinb = 2 sin, 2, a-b, cos, 2, a+b, cosa+ cos b = 2 cos, sin a cos b =[sin(a+b) +sin(a – b)], a+b, cos, 2, a-b, cos asin b =-, [sin(a+b)– sin(a-b)], cosa- cos b =-2 sin, Oncert gyan