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How Is Cos X Cos X

We need to know how is cos(-x) = cos x Cosine and sine values are complementary, Thus cos a = sin (90-a). cos (-x) = sin (90+x) { using th... View Article

Define 11 Ratio

A ratio is a mathematical expression written in the form of a:b, where a and b are any integers. It expresses a fraction. The ratio is used to... View Article