Trig Identities 0.0 / 5 ? MathematicsTrigonometry and radiansA2/A-levelOther Created by: biran4454Created on: 09-02-22 10:50 cosec(x) = 1/sin(x) 1 of 14 sec(x) = 1/cos(x) 2 of 14 cot(x) = 1/tan(x) 3 of 14 sin^2(x) + cos^2(x) = 1 4 of 14 sin(x) / cos(x) = tan(x) 5 of 14 sin(A +- B) = sin(A) cos(B) +- sin(B) cos(A) 6 of 14 cos(A +- B) = cos(A) cos(B) -+ sin(A) sin(B) 7 of 14 tan(A +- B) = (tan(A) +- tan(B)) / 1 -+ tan(A) tan(B) 8 of 14 sec^2(x) = 1 + tan^2(x) 9 of 14 cosec^2(x) = 1 + cot^2(x) 10 of 14 For small x, sin(x) ≈ x (radians only) 11 of 14 For small x, cos(x) ≈ 1 - (x^2 / 2) 12 of 14 For small x, tan(x) ≈ x / (1-(x^2 / 2)) 13 of 14 Thus for small x, tan(x) ≈ x / cos(x) 14 of 14
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