1.rút gọn
$\frac{1-cos2x}{sin2x}$
p= cos2x + 2
m ∈ Δ $\left \{ {{x= -2 + t} \atop {y = 3 +t}} \right.$ cách a = √5
1.rút gọn
$\frac{1-cos2x}{sin2x}$
p= cos2x + 2
m ∈ Δ $\left \{ {{x= -2 + t} \atop {y = 3 +t}} \right.$ cách a = √5
Đáp án:
$\begin{array}{l}
A = \dfrac{{1 – \cos 2x}}{{\sin 2x}}\\
= \dfrac{{2{{\sin }^2}x}}{{2.\sin x.\cos x}}\\
= \dfrac{{\sin x}}{{\cos x}}\\
= \tan x\\
P = \cos 2x + 2\\
= 2{\cos ^2}x – 1 + 2\\
= 2.{\cos ^2}x + 1
\end{array}$