User:MeYCChang/ZZZ

HOW TO TYPE EQUATIONS


 * $$\frac{1}{2} \sqrt{(\mathbf{AB} \cdot \mathbf{AB})(\mathbf{AC} \cdot \mathbf{AC}) -(\mathbf{AB} \cdot \mathbf{AC})^2} =\frac{1}{2} \sqrt{ |\mathbf{AB}|^2 |\mathbf{AC}|^2 -(\mathbf{AB} \cdot \mathbf{AC})^2} \, .$$


 * $$S = \sqrt{s(s-a)(s-b)(s-c)}$$


 * $$\cos A = \frac {\textrm{adjacent}} {\textrm{hypotenuse}} = \frac {b} {h}\,.$$

$$(1)\ sqrt{(A+B)}=\sqrt{C}$$

$$(2)\ sqrt{\mathbf{A}+\mathbf{B}}=\sqrt{D}$$

$$(3)\ sqrt{(AB)}$$

$$(4)\ sqrt{\mathbf{A}\cdot\mathbf{B}}$$

$$(5)\ sqrt{(\mathbf {A}+\mathbf{B})-\mathbf {C}\cdot\mathbf {D})}=\mathbf{56}$$

$$(6)  S = \sqrt{\mathbf{s}\cdot(\mathbf{s}-\mathbf{a})\cdot(\mathbf{s}-\mathbf{b})\cdot(\mathbf{s}-\mathbf{c})}$$

$$(7)  G1 = SIN(7PI/K) = \sqrt{(\frac{1}{2}+\frac{\sqrt{2}}{8})}$$

$$(8)\ frac{1}{\frac{5}{2}}  $$