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

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.