∫ (secx)dx + ∫ (cosxy) dx
"\\int(secx)dx+\\int(cosxy)dx="
"=\\int(secx)*(secx+tanx)\/(secx+tanx)dx+1\/y\\int(cosxy)dxy="
"=\\int1\/(secx+tanx)d(secx+tanx)+(sin(xy))\/y="
"=ln(sec x + tan x)+(sin(xy))\/y+C"
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