Question
$\int_{}^{} {\sec x\;dx = } $
$= - \log (\sec x - \tan x) + c$.
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$2 x+y-z=3$
$x-y-z=\alpha$
$3 x+3 y+\beta z=3$ के अनंत हल है, तो $\alpha+\beta-\alpha \beta$ बराबर है ............. |