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## Answers

hence= 1/sinfi cos fi= 1/1/2sin2fi= 2 coec2fi

X^2=sec^2fi+cosec^2fi

=1/cos^2fi+1/sin^2fi

=(sin^2fi+cos^2fi)/(sin^2fi cos^2fi)

=1/(sin^2fi cos^2fi)

X^2=sec^2fi cosec^2fi

X = sec fi. cosec fi

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hence= 1/sinfi cos fi= 1/1/2sin2fi= 2 coec2fi

X^2=sec^2fi+cosec^2fi

=1/cos^2fi+1/sin^2fi

=(sin^2fi+cos^2fi)/(sin^2fi cos^2fi)

=1/(sin^2fi cos^2fi)

X^2=sec^2fi cosec^2fi

X = sec fi. cosec fi