If sin 2X = COS ZY and m2X = 72°, what is the measure of ZY?
18°
072°
90°
108°
2 answers:
Answer:
<u>18°</u>
Step-by-step explanation:
sin 2x=cos zy
m(2x)=72°
cos(π/2-a)=sin a
cos(π/2-72°)=sin72°
cos18°=sin72°
=>m(zy)=18°
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