1) For what values is the statement true? sin(x+20)°=cos(y−10
x=20, y=60
x=20, y=50
x=30, y=40
x=30, y=60
2)In right triangle ABC with right angle C, sinA=4/5 and cosA=3/5. What is sinB+cosB?
1/5
7/5
35/12
5/7
3)In a right triangle ABC where sinA=cosB, what are the measures of acute angles A and B if the measure of angle A is three times the measure of angle B?
The measure of angle A is 67. 5° and the measure of angle B is 22. 5°.
The measure of angle B is 135° and the measure of angle A is 45°.
The measure of angle A is 135° and the measure of angle B is 45°.
The measure of angle B is 67. 5° and the measure of angle A is 22. 5°.
4)What is the value of b that makes the equation cos(17b+26)°=sin(15b)° true?
13
2
9. 5
3