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Mathematics 11 Online
OpenStudy (anonymous):

Which pair of angles has congruent values for the sin x° and the cos y°? a. 70°; 160° b. 70°; 70 c. 70°; 120° d. 70°; 20°

Directrix (directrix):

The sine of an acute angle and the cosine of the complement of that angle are the same - that's one of the cofunction identities. @lowcard2

Directrix (directrix):

Do you see a pair of complementary angles among the options?

OpenStudy (anonymous):

d?

Directrix (directrix):

That is what I got.

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