Cos 90 Degrees: Value of cos 90 with Proof, Examples and FAQ - mydomain

Meta Description: We can calculate the sum of the terms in a geometric progression using the formula S = a(1-r^n)/(1-r) when r < 1 and S = a(r^n-1)/(r-1)when r>1

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I know these do not equal 90 degrees used random numbers. My question is am I understanding Sin,Cos and Tan? : r/askmath

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