Simplify the Expression (Double-Angle or Half-Angle)

l flipboi l · #1 $Old$ November 3rd, 2009, 03:10 PM

Hello,

Can someone please help me with simplifying this problem?

1) 2tan7 / 1-tan7
2) sqrt(1-cos30 /2)

skeeter · #2 $Old$ November 3rd, 2009, 05:38 PM

Quote:

Originally Posted by l flipboi l $View Post$

Hello,

Can someone please help me with simplifying this problem?

1) 2tan7 / 1-tan7

2) sqrt(1-cos30 /2)

(1) double angle should be $\frac{2\tan(7)}{1 - \tan^2(7)} = \tan(14)$

(2) $\sqrt{\frac{1-\cos(30)}{2}} = \sin(15)$