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∫1/(sinx+cosx)dx
=∫√2/cos(x-π/4)dx
=√2∫sec(x-π/4)dx
=√2∫sec(x-π/4)d(x-π/4)
=√2*ln|sec(x-π/4)+tan(x-π/4)|+C
参考来源:http://hi.baidu.com/%BC%F2%B3%C6%B6%E9%CC%EC%CA%B9/blog/item/56c159624287c0d7e7113aa4.html
=∫√2/cos(x-π/4)dx
=√2∫sec(x-π/4)dx
=√2∫sec(x-π/4)d(x-π/4)
=√2*ln|sec(x-π/4)+tan(x-π/4)|+C
参考来源:http://hi.baidu.com/%BC%F2%B3%C6%B6%E9%CC%EC%CA%B9/blog/item/56c159624287c0d7e7113aa4.html
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