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In trigonometry, cofunctions (sine and cosine, cosecant and secant, and tangent and cotangent) of __________________________ angles are congruent.

A)
complementary
B)
right
C)
straight
D)
supplementary

User Rapptz
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The correct answer to complete the given statement above would be option A. In trigonometry, cofunctions of complementary angles are congruent. Angles are considered complements if together they equal a right angle. For example, an angle of 60 degrees is a complement of an angle measuring 30 degrees. 
User Anatole Lucet
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