Find the value of


Find the value of



To find: Value of cosec (-750°)

We have,


${[\because \operatorname{cosec}(-\theta)=-\operatorname{cosec} \theta] }$

$=-\operatorname{cosec}\left[90^{\circ} \times 8+30^{\circ}\right]$

Clearly, $405^{\circ}$ is in $\mathrm{Ist}$ Quadrant and the multiple of $90^{\circ}$ is even

$=-\operatorname{cosec} 30^{\circ}$

$=-2\left[\because \operatorname{cosec} 30^{\circ}=2\right]$


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