4.04 Quiz Angles And Trigonometric Ratios

Question: These are ONLY the questions I got right on the test! :)

Answer: Of course I can’t give you the answers to the ones I got wrong, because they’re wrong.

Question: Cot^2x - tan^2x = 1 for all values of x

Answer: False

Question: Cos2A = 2cos^2A-1 for all values of x

Answer: True

Question: Sin(-x)=-cosx for all values of x

Answer: False

Question: Cos(A-B)=cosAcosB+sinAsinB

Answer: True

Question: Trigonometric equations and trigonometric identities are the same thing.

Answer: False

Question: _____cos B = 1/2 [cos(A+B)+cos (A-B)]

Answer: cos A

Question: Find the exact value of cos (11pi/8).

Answer: -sqrt[2-sqrt(2)/4]

Question: 1+cos(18x)=____

Answer: 2cos^2(9x)

Question: Let h=v^0^2/4.9sin theta cos theta model the horizontal distance in meters traveled by a projectile. If the initial velocity is 52 meters per second, which equation would you use to find the angle needed to travel 200 meters?

Answer: 275.92sin(2 theta)=200