- If cos(a-b)/cos(a+b) = 1/2. what is tanatanb? PLEASE HELP :(?

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Why did My Mom gave Me crappy genes? Need help with recurrences!
MATH/COMPUTER SCIENCE RELATED
Problem is attached? What is the sum of 3x^3-2x+8, 2x^2 +5x, and x^3+2x^2-3x-3 ???? PLEASE HELP? A circle has a circumference of 14 mm. What's it's area? Find the test statistic obtained when testing the claim that p=0.4 when given sample data consisting of x=30 successes among n=100 trials.?