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Answer:
2)3x^2-4x+3+3x-8x^2-9
=-5x^2-1x-6
3)A=30
B=60
C=x
in a triangle,sum of three angles is 180 degrees
A+B+C=180
30+60+x=180
90+x=180
x=180-90=90 degrees
hence,it is a right angles triangle
4) answer is 60 degrees
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