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मान ज्ञात कीजिए - ` "cosec"^(-1)(-2)`

Answer» मान `"cosec"^(-1)(-2)=theta , -pi//2 le theta lt 0 (theta lt 0)`
`implies "cosec"theta =-2 implies "cosec" theta="cosec"(-(pi)/(6))`
`implies theta=-(pi)/(6)`
`:. "cosec"^(-1)(-2) "का मुख्य मान "=-(pi)/(6)`


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