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Find the 11 term of the following geometric sequence.
10, 30, 90, 270,

Evaluate cos2θ for cosθ = square root of 3/2

An octagonal prism has jow many lateral faces?

Solve: 25 points find the fifth term of an increasing geometric progression if the first term is equal to 7−3 √5 and each term (starting with the second) is equal to the difference of the term following it and the term preceding it.