In right triangle ABC, when angles A and B add up to 90 degrees, what is the cosine of B equal to?

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In right triangle ABC, when angles A and B add up to 90 degrees, what is the cosine of B equal to?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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tje total angel in a triangle is 180
so, probable 90 degree
oh what sinB right?

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Other answers:

sin B c. sin A b. tan A d. cos A
cosB=sinA since they might be both 45, 45 degrees
oh
thank you
i wish i have a drawing . it would be better

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