证明：(1 + tan x) / (sin x + cos x) = 1 / cos x_数学解答

证明：(1 + tan x) / (sin x + cos x) = 1 / cos x

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解答

(1+tanx)/(sinx+cosx) = (1+sinx/cosx)/(sinx+cosx) = (sinx+cosx)/cosx/(sinx+cosx) = 1/cosx