book Maths Puzzle Numerical Ability

"solve for x"

1) 4x^2+12x+9=0
2) 7(x+2)^2=12
3) 2x^2-8x+5=0
4) (2x-5)/(x-3)=(4x+1)/(2x)

p.s. thanks

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book Other Question

why should we take sin theta as opposite/hypotenuse is there any proof for it can u please send it to me on my email address PLEASE-HELP
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