Answers edited by J'Neal

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• How do you find the explicit rule for the geometric sequence #15, 3, 3/5, 3/25#?
  
• How do you find the amplitude, period, vertical and phase shift and graph #y=2/5tan(6theta+135)-4#?
  
• How do you use the binomial series to expand #(1 - 4x)^8#?
  
• How do you find all solutions of #2cos^2(θ)-1=0# to be #pi/4 +kpi# and #3pi/4 + kpi#? I keep getting #2kpi# instead of #kpi#