book Maths Puzzle Numerical Ability

what is the exact value of sin 22.5 degrees using the sum, difference, half, or double angle formulas and the exact value chart in the solution.

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book Other Question
solve by factoring.
1) x2-5x+6=0
2) 2x2-9x-5=0
3) 3x2+5x-2=0 5 square root 20 + square root 24 - square root 180 + 7 square root 54