Angle Formulae Test

Unit Test #43

Select your answers to the following 5 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.

 

 

Q1:

 

Expand cos(90 - A).

A. cos A

B. sin A

C. -cos A

D. - sin A
Answer 1:

 

Q2:

 

 If sin x = 0.8 and cos x = 0.6, find cos 2x

A. 0.28

B. 1.6

C. 0.96

D. -0.28
Answer 2:

 

Q3:

 

Write as a sum:

2cos 35° sin 10°

A. sin 45° - sin 25°

B. sin 25° - sin 45°

C. sin 45° + sin 25°

D. sin 25° + sin 45°
Answer 3:

 

Q4:

 

 

Write as a product:

sin 50° - sin 40°

A. 2cos 90° sin 10°

B. -2cos 45° sin 5°

C. 2cos 45° sin 5°

D. cos 45° sin 5°
Answer 4:

 

Q5:

 

Which one is false?

cos 2A =

A. cos2A - sin2A

B. 2sin A cos A

C. 2cos2A - 1

D. 1 - 2sin2A
Answer 5: