Q6 of 268 Page 4

If A=60^o and B = 30^o, verify that :
tan (A – B) =

Given: A=60^o and B =30^o

Now, LHS = tan (A-B)

⇒ tan (60 ^o - 30 ^o)

⇒ tan (30 ^o)

Now, RHS

∴ LHS = RHS

Hence Proved

If A=60^o and B = 30^o, verify that :

cos (A+B) = cos A cos B – sin A sin B

If A=60^o and B = 30^o, verify that :

sin (A – B) = sin A cos B – cos A sin B

If A = 30^o, verify that :

sin 2A = 2 sin A cos A

If A = 30^o, verify that :

cos 2A = 1-2 sin²A=2cos² A – 1

If A=60o and B = 30o, verify that :tan (A – B) =