Trig DTP 4/7

Please select the correct solution

cos ² x + sin ² x=

^{(It's on your reference sheet!!)}

• 1

• csc ² x + sec ² x

• sin ² x

• 1 - sin ² x

sin2u =

• $\sin u\cos u$

• $2\sin u\cos u$

• $\sin^2u$

• $2\sin^2u$

Which of the following are equivalent to cos2u?

•  $\cos^2u-\sin^2u$  

•  $2\cos^2u-1$  

•  $1-2\sin^2u$  

•  $1-\sin^2u$  

•  $\sin^2u-\cos^2u$  

tan u/2 =

• $\frac{\sin\ u}{1+\cos\ u}$

• $\frac{\cos\ u}{1+\sin u}$

• $\frac{1+\cos u}{\sin u}$

• $\frac{\sin u}{1-\cos u}$

• $\frac{1+\sin u}{\cos u}$

tan 2u =

• $\frac{2\tan u}{1-\tan^2u}$

• $\frac{\tan^2u}{1+\tan u}$

• $\frac{2\tan u}{1+\tan^2u}$

• $\frac{\tan^2u}{1-\tan u}$