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OpenStudy (gabylovesyou):
Which pair of angles has congruent values for the sin x° and the cos y°? 50°; 40° 50°; 50° 50°; 100° 50°; 130°
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OpenStudy (anonymous):
first one
OpenStudy (anonymous):
because sin50=cos40
OpenStudy (anonymous):
they add up to give 90
OpenStudy (cj49):
sin(90-a)=cos a
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