1.

निम्न समाकलों के मान ज्ञात कीजिए - (i) `int_(-pi//4)^(pi//4)"cosec"^(2)xdx`

Answer» Correct Answer - `-2`
`I=int_(-pi//4)^(pi//4)"cosec"^(2)xdx=2int_(0)^(pi//4)"cosec"^(2)xdx`
`=2[-cot x]_(0)^(pi//4)=-2[cot.(pi)/(4)-cot 0]=-2`


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