Question This Week.....

There are two questions coming from my visitor :

1.

Tg ( p + q) = ½....(1)

Tg (p – q) = ¹/_3........(2)

Tg 2p = ...?

Answer

:

If : p + q = A  and p – q = B

With elimination we find :

2p = A + B

Tg 2p = Tg (A + B) =

=

2.

Sin (3x + 2y) = ¹/₈......(1)

Sin ((3x – 4y) = ¼ .....(2)

Sin 6y = ....?

Answer :

Misalkan

(3x + 2y) = A ® Sin A = ¹/₈

(3x – 4y) = B ® Sin B = ¼

With elimination we find :

6y = A - B

So sin 6y = sin (A – B)

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

=

I hope my explanation make you clear and can understand.....