Given a triangle determine the double angle for cosine

What is the initial step in calculating the cosine of two theta?

• Add sine and cosine

• Multiply sine and cosine

• Square the cosine value

• Square the sine value

In trigonometry, what does the cosine represent in a right triangle?

• Opposite over hypotenuse

• Adjacent over hypotenuse

• Opposite over adjacent

• Hypotenuse over adjacent

What is the result of squaring the cosine value of -3/5?

• 5/3

• 25/9

• 9/25

• 16/25

What is the final result of the calculation involving cosine and sine squares?

• -7/2

• 7/2

• -9/16

• 9/16

What is emphasized about trigonometric calculations in a triangle?

• They are complex

• They are simple

• They are impossible

• They are unnecessary