急求两道微积分计算题,明天考试,这类的题不大懂,求一下过程,先谢谢大家了!
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4. sin(y) =0 ,when y = 2*k*pi , k= 0,1,2,....
=> 4X+5 = 2*k*pi
=> X = ( 2*k*pi -5) /4 , k= 0,1,2,....
the end
5. ln(y) exist when y > 0
=> x / sin (x) > 0
1. x >0 and sin(x)>0
=> 2*k*pi < x < pi+2*k*pi k= 0,1,2,....
2.. x < 0 and sin(x) <0
=> -pi-2*k*pi < x < - 2*k*pi k= 0,1,2,....
在1 或2的范围内 the ends
=> 4X+5 = 2*k*pi
=> X = ( 2*k*pi -5) /4 , k= 0,1,2,....
the end
5. ln(y) exist when y > 0
=> x / sin (x) > 0
1. x >0 and sin(x)>0
=> 2*k*pi < x < pi+2*k*pi k= 0,1,2,....
2.. x < 0 and sin(x) <0
=> -pi-2*k*pi < x < - 2*k*pi k= 0,1,2,....
在1 或2的范围内 the ends
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