exam Maths Puzzle Numerical Ability

Solve equation on the interval 0<=Theta<2 Pie
cos(2theta)=2-2sin squared Theta
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exam Other Question

A common ant absorbs oxygen at rat of about 6.2 milliliters per second per square centimeters of exoskeleton. It needs about 24 milliliters of oxygen per second per cubic centimete Solve the system by substitution.
x + 4y = -4
3x - 3y = -12