অঙ্ক শেখো বাংলায়
x = sin t, y = sin kt (\(k \neq 0\) ধ্রুবক ) হলে দেখাও যে, \((1 - x^2) {{d^2y}\over{dx^2}} - x {{dy}\over{dx}}+ k^2y = 0\)
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