$$\int \Big(sec(x+a)^2+2sec(x+a)sec(x+b)+sec(x+b)^2\Big)dx $$
$$\int sec(x+a)^2 dx + \int sec(x+b)^2dx + \int 2sec(x+a)sec(x+b)dx $$
$$ tan(x+a) +tan(x+b) -ln\mid cos(x+a)\mid-ln\mid cos(x+b)\mid+ \int 2sec(x+a)sec(x+b)dx $$
ได้แค่นี้อะครับ ติด $$\int 2sec(x+a)sec(x+b)dx $$
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It is what we fight with when all else is lost.
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