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a<x^{2}-1, b>2 x+1find the value of c |
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Answer» x^2+x+1 > (x^2-1) and also > 2x+1 Cosθ= ((x^2-1)^2 + (2x+1)^2- (x2 + x + 1)^2)/ (2 (x2 – 1)(2x + 1)= ((x^2-1)^2 - (x2 + x + 1)^2)+ (2x+1)^2)/ (2 (x2 – 1)(2x + 1)= (2x^2+x)(-x-2)+ (2x+1)^2/(2 (x2 – 1)(2x + 1)=-x (2x+1)(x+2)+ (2x+1)^2/(2 (x2 – 1)(2x + 1)=(-x (x+2)+ (2x+1))/(2 (x2 – 1)=(-x^2 +1)/(2 (x2 – 1)= -1/2θ= π- π/3= 2π/3= 120 degdl i havent got uh m sry can u explain this again... |
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