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Maths Puzzle
Numerical Ability
using sum, difference, half, or double angle formulas and the exact value chart in the solution, find the exact value of cos 105 degrees.
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a motorboat traveled for 2 hours with an 8 km/h current. the return trip against the same current took 3 hours. find the speed of the motorboat in still water.
what percent of 30 is 90