Verify the identity:
cos^2x+cos^2xtan^2x=sec^2x-tan^2x

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Which one is the correct answer, and why?