題組內容

4. (10%) Given φ₁(t) = 1, φ₂(t) = -t, φ₃(t) = 2t² - 1,

(b) Are \( \varphi_1(t) \) and \( \varphi_2(t) \) mutually orthogonal over the interval (-1, 1)? Why or why not?