求不定积分 ∫[1/(sinx+cosx+√2 )] dx 在线等
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原式=∫1/[√2sin(x+π/4)+√2]dx
=(1/√2)∫1/[1+sin(x+π/4)]d(x+π/4)
上下同乘1-sin(x+π/4)
=(1/√2)∫[1-sin(x+π/4)]/[(cos(x+π/4))^2] d(x+π/4)
=(1/√2)[tan(x+π/4)-sec(x+pi/4)] + C
=(1/√2)∫1/[1+sin(x+π/4)]d(x+π/4)
上下同乘1-sin(x+π/4)
=(1/√2)∫[1-sin(x+π/4)]/[(cos(x+π/4))^2] d(x+π/4)
=(1/√2)[tan(x+π/4)-sec(x+pi/4)] + C
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∫[1/(sinx+cosx+√2)]dx
=(1/√2)∫{1/[cosxcos(π/4)+sinxsin(π/4)+1]}dx
=(1/√2)∫{1/[1+cos(x-π/4)]}dx
=[1/(2√2)]∫{1/[cos(x/2-π/8)]^2}dx
=(1/√2)∫{1/[cos(x/2-π/8)]^2}d(x/2-π/8)
=(√2/2)tan(x/2-π/8)+C
=(1/√2)∫{1/[cosxcos(π/4)+sinxsin(π/4)+1]}dx
=(1/√2)∫{1/[1+cos(x-π/4)]}dx
=[1/(2√2)]∫{1/[cos(x/2-π/8)]^2}dx
=(1/√2)∫{1/[cos(x/2-π/8)]^2}d(x/2-π/8)
=(√2/2)tan(x/2-π/8)+C
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