Find the value of
To find: Value of 
We have,
[∵ cosec(-θ) = -cosec θ]
Putting π = 180°
= -cosec[41 × 45°]
= -cosec[1845°]
= -cosec [90° × 20 + 45°]
Clearly, 1845° is in Ist Quadrant and the multiple of 90° is even
= -cosec 45°
= -√2 
1
Find the value of
To find: Value of
We have,
[∵ cosec(-θ) = -cosec θ]
Putting π = 180°
= -cosec[41 × 45°]
= -cosec[1845°]
= -cosec [90° × 20 + 45°]
Clearly, 1845° is in Ist Quadrant and the multiple of 90° is even
= -cosec 45°
= -√2