Q4 of 268 Page 4

Evaluate the following :

We know that

tan (60^o) =

cos(90^o) = 0

cosec (30^o) = 2

sec (60 ^o) = 2

cot (30^o) = √3

Now putting the values, we get

= 9

Evaluate the following :

cos30°.cos45° – sin30°.sin45°

Evaluate the following :

Prove the following :

When B = 30°