3 years ago
Which pair of angles has congruent values for the
sin x° and the cos y°?
a. 35°; 55°
b. 35°; 145°
c. 35°; 70°
d. 35°; 35°
a. 35°; 55°
b. 35°; 145°
c. 35°; 70°
d. 35°; 35°
1 Answers
Best Answer
denleab Staff answered 3 years ago
denleab Staff answered 3 years ago
Step 1
Note:
cos (90 θ) = cos(90) cos θ + sin (90) cdot sin θ = 0 * cos θ + 1 sin θ
cos (90 θ) = sin θ
Step 2
Using, it θ=35, then
cos (90-35) = sin (35)
cos (55) = sin (35)
35°, 55°
option a is correct.