Substitution method.
y=x - 5
y —3х – у = -3
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If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

10 points? me . its important ‼️‼️

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?