Question 1016252
1 + sin x = cos x/sec x - tan x
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1 + sin x = cos^2 x - tan x
1 + sin x = cos^2 x - tan x = cos^2 - sin/cos
1 + sin x = cos^2 x - tan x = 1 - sin^2 - sin/cos = sin*(sin - 1/cos)
1 + sin x = sin*(sin - 1/cos)
@ x = 0, 1 + 0 =? 0*(0 - 1)
Not an identity.