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What should be added to equation to make it a perfect square 9x^4 + 2x^2 + 25? ....Please!? How do i confirmed the identity of a person saw over the internet? Find the sum of cos^2 x + cos^2 (x+1°) + cos^2 (x+2°) + ... + cos^2 (x+179°).? If the fifth term of a geometric sequence is 81 and the common ratio is 3/4, find the sum of the first 20 terms? Given f(x)=x+2k/3x-2, find the value of k if f^-1(1)=3
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