Answer :

To find: Value of cosec (-750°)

We have,


cosec (-750°) = - cosec(750°)


[ cosec(-θ) = -cosec θ]


= - cosec [90° × 8 + 30°]


Clearly, 405° is in Ist Quadrant and the multiple of 90° is even


= - cosec 30°


= -2 [ cosec 30° = 2]


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