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| 1. |
Evaluate `int(secx)/((secx+tanx)) dx`. |
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Answer» `int(sec x)/((secx + tanx)) dx = int(secx)/((secx + tanx)) xx((secx - tanx))/((secx - tanx)) dx` `= int ((sec^(2)x - secx tanx))/((sec^(2)x - tan^(2)x)) dx` `= int(sec^(2)x - secx tanx) dx` `= int sec^(2) xdx - int sec x tan x dx = tan x - secx + C`. |
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