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Sigma n = 1 to infinity cos^2na = 1/2(n + (cos(n+1)a sin n a / sina ))? If you touched mustard gas as a solid, what would the effects be? Do you agree with the Meteorologist who now say the weather cycles every XX days? How to find the frequency of the fundamental of a 1.5 meter long string that weighs 3.3 grams that has a tension of 86N? The variable z varies Inversely with x. When x is 3, Z has the value 2. What is the value of z When x= 13 ? Round To thousandths place?