Q1 of 46 Page 284

Evaluate the following.

B.

By trigonometric identities,


cos 45° = 1/√2


sec 30° = 1/cos 30° = 2/√3 [∵, cos 30° = √3/2]


cosec 60° = 1/sin 60° = 2/√3 [∵, sin 60° = √3/2]


Putting all these in , we get



⇒


⇒


Thus, .


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