sin x: 1/sec(90- x), 1/csc x, cos (90 - x) , cos x: 1/csc (90 - x), 1/sec x, sin (90 - x), cot (90-x): tan x, 1/cot x, sin x/ cos x, sec x: 1/sin (90 -x), csc (90 - x), 1/cos x, sec (90 - x): csc x, 1/cos (90 - x), 1/sin x, 1/tan x: cot x, tan (90 - x), cos x / sin x, sin^2 x + cos ^2 x: 1, sec 2 x - tan 2 x, csc 2 x - cot 2 x, cot^2 x - csc^2 x: -1, -sin 2 x - cos 2 x, tan 2 x - sec 2 x,

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