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Check the picture below.
notice, in a right-triangle, there is a right-angle, thus is called a right-triangle, and the other angles are complementary angles.
notice the relation of the cosine and sine of each, in the example in the picture.
notice, in a right-triangle, there is a right-angle, thus is called a right-triangle, and the other angles are complementary angles.
notice the relation of the cosine and sine of each, in the example in the picture.