# Identities - x =-sin x equation 15 sin pi/2 x = cos x...

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Identities. tan x = sin x /cos x equation 1 cot x = cos x /sin x equation 2 sec x = 1/cos x equation 3 csc x = 1/sin x equation 4 cot x = 1/tan x equation 5 sin 2 x + cos 2 x = 1 equation 6 tan 2 x + 1 = sec 2 x equation 7 1 + cot 2 x = csc 2 x equation 8 cos ( x +- y ) = cos x cos y -+ sin x sin y equation 9 sin ( x +- y ) = sin x cos y +- cos x sin y equation 10 cos (- x ) = cos x equation 11 cos ( pi /2 - x ) = sin x equation 12 cos (2 x ) = cos 2 x - sin 2 x = 2 cos 2 x - 1 = 1 - 2 sin 2 x equation 13 cos ( x /2) = +-[(1/2) (1 + cos x )] 1/2 equation 14 sin (-

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Unformatted text preview: x ) = -sin x equation 15 sin ( pi /2 - x ) = cos x equation 16 sin (2 x ) = 2 sin x cos x equation 17 tan ( x +- y ) = (tan x +- tan y )/(1 -+ tan x tan y ) equation 18 tan (-x ) = -tan x equation 19 tan (2 x ) = 2 tan x /(1 - tan 2 x ) equation 20 tan ( x /2) = sin x /(1 + cos x ) equation 21 cos ( pi +- x ) = -cos x equation 22 sin ( pi +- x ) = -+sin x equation 23 tan ( pi +- x ) = +-tan x...
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Identities - x =-sin x equation 15 sin pi/2 x = cos x...

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