なかなか面白い。行列の固有値を出してみたり。
http://www.wolframalpha.com/input/?i=Eigenvalues%28%28j%2F4%2Bh%2C0%2C0%2C0%29%2C%280%2C-j%2F4%2Cj%2F2%2C0%29%2C%280%2Cj%2F2%2C-j%2F4%2C0%29%2C%280%2C0%2C0%2Cj%2F4-h%29%29
前回個人的にちょっと詰まった、coth(x)とか。
http://www.wolframalpha.com/input/?i=coth%28x%29