Q. 9 E4.5( 2 Votes )

# Find the value ofcosec (-7500)

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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