Maths Double Angel and Trig Identities 5.0 / 5 based on 1 rating ? MathematicsProofTrigonometry and radiansA2/A-levelAQA Created by: CrissDragonCreated on: 02-06-16 19:49 sin2x = 2sinxcosx ; (2tanx)/(1+tan^2x) 1 of 7 cos2x = cos^2x-sin^2x ; 2cos^2x-1 ; 1-2sin^2x ; (1-tan^2x)/(1+tan^2x) 2 of 7 tan2x = (2tanx)/(1-tan^2x) 3 of 7 sec^2x = 1 +tan^2x 4 of 7 cosec^2x = 1 +cot^2x 5 of 7 tan^2x = sec^2x-1 6 of 7 cot^2x = cosec^2x-1 7 of 7

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