HTML 3 math example

∫_a_^b^{f(x)1+x} dx f(x) = {( 1+x sin x )} {ω^2^c^2^} | <j | μ_z_ | i> | {∫_0_^&inf;^ ∫_0_^&inf;^ f(x,y)x^2^ + y^2^} dx dy n = 0&inf; ∑_n = 0_^&inf;^ 4LiH + AlCl_3_ →^ether^ LiAlH_4_ + 3LiCl Xai _4_^9^Be + _2^4^He → _6_^12^C + _0_^1^n Xa bY XaYb X + Y X + Y n(n - 1)(n - 2)&dots;(n - m + 1) total of m factors X + Y X + Y n(n - 1)(n - 2)&dots;(n - m + 1) total of m factors X X 1 + x 31 + x a_11_a_12_&cdots;a_1n_ &vdots;&vdots;&ddots;&vdots; a_n1_a_n2_&cdots;a_nn_ a_11_x_1_a_12_x_2_&cdots;a_1n_x_n_b_1_ a_21_x_1_a_22_x_2_&cdots;a_2n_x_n_b_2_ &dotfill; a_n1_x_1_a_n2_x_2_&cdots;a_nn_x_n_b_n_ dummyijk aX_11_X_21_X_31_ bX_12_X_22_X_32_ cX_31_X_32_X_33_ --term-- --term--