∫(1+sinx )/(sin3x +sinx )d x 怎么求
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∫(1+sinx )/(sin3x +sinx )d x 怎么求
∫(1+sinx )/(sin3x +sinx )d x 怎么求
∫(1+sinx )/(sin3x +sinx )d x 怎么求
∫ (1 + sinx)/(sin3x + sinx) dx
= ∫ (1 + sinx)/[2sin(3x + x)/2 * cos(3x - x)/2]
= (1/2)∫ dx/(sin2xcosx) + (1/2)∫ sinx/(sin2xcosx) dx
= (1/2)∫ dx/(2sinxcos²x) + (1/2)∫ sinx/(2sinxcos²x) dx
= (1/4)∫ cscxsec²x dx + (1/4)∫ sec²x dx
= (1/4)∫ cscx(1 + tan²x) dx + (1/4)tanx
= (1/4)∫ cscx dx + (1/4)∫ secxtanx dx + (1/4)tanx
= (1/4)ln| cscx - cotx | + (1/4)(secx + tanx) + C
∫(1+sinx )/(sin3x +sinx )d x 怎么求
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高数 limx→π /2 cos3x*sin3x/(cosx*sinx)=?根据极限四则运算 =lim x→π /2 cos3x/cosx * lim x→π /2 sin3x/sinx再用洛必达法则 =lim x→π /2 -3sin3x/-sinx * lim x→π /2 sin3x/sinx=-3-1=-4哪错了...答案里写的是=-lim x
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