Question
Evaluate the following limit:
$\lim\limits_{\text{x}\rightarrow{\frac{\pi}{2}}}\frac{\sin2\text{x}}{\cos\text{x}}$
$\lim\limits_{\text{x}\rightarrow{\frac{\pi}{2}}}\frac{\sin2\text{x}}{\cos\text{x}}$
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$(2 x-1)^4+4(2 x-1)^3(3-2 x)+6(2 x-1)^2(3-2 x)^2+4(2 x-1)^1(3-2 x)^3+(3-2 x)^4$
$(x+1)^4-4(x+1)^3(x-1)+6(x+1)^2(x-1)^2-4(x+1)(x-1)^3+(x-1)^4$
$(0.9)^4$