exam Maths Puzzle Numerical Ability

if sec0=3 and tan0=2sqr root 2 what are the values of

cot0

sin0

cos^2 0

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Systems of equations can be solved by graphing or by using substitution or elimination. What are the pros and cons of each method? Which method is the best? Why? What circumstances Please graph the following: y=2x. Thanks!!!! McGraw Hill 6th edition, Chp. 71. Problem # a.