Fundamentals of trigonometry

180 degrees is equal to how many radians?

• 1 2 pi
• 2 1
• 3 pi / 2
• 4 pi

sin(90 degrees) equals:

• 1 0
• 2 -1
• 3 1
• 4 1/2

The length of an arc of radius 5 cm subtending an angle of 2 radians is:

• 1 10 cm
• 2 2.5 cm
• 3 25 cm
• 4 7 cm

tan x is equal to:

• 1 sin x / cos x
• 2 cos x / sin x
• 3 sin x cos x
• 4 1 / sin x

sin(2x) is equal to:

• 1 sin² x
• 2 cos² x - sin² x
• 3 2 sin x cos x
• 4 2 sin x

cos² x - sin² x equals:

• 1 sin 2x
• 2 tan 2x
• 3 1
• 4 cos 2x

sin(A + B) equals:

• 1 sin A sin B + cos A cos B
• 2 sin A cos B + cos A sin B
• 3 cos A cos B
• 4 sin A + sin B

The period of sin x is:

• 1 2 pi
• 2 pi / 2
• 3 pi
• 4 4 pi