Trigonometry

sin 2B = 2 sin B is true when B is equal to

• 90°

• 60°

• 30°

• 0°

TanA×CotA = ?

• 0

• 1

• 2

• 3

In triangle ABC, AC = 1 cm, BC  = √3 cm ,then cot B 

• 1/√3
• √3
• √3/2
• 2

In triangle ABC, BC = 4 cm, AB =5 cm ,then cos A is 

• 3/5
• 4/5
• 3/4
• 4/3

What is the green side labelled as using the starred angle as a starting point?

• adjacent

• opposite

• hypotenuse

What is the green side labelled as from the starred angle?

• adjacent

• opposite

• hypotenuse

Sum of interior angles of a triangle is ........