[M] Show that {t, sin t, cos 2t, sin t cos t} is a linearly independent set of functions defined on ℝ. Start by assuming that
c1 · t + c2 · sin t + c3 · cos 2t + c4 · sin t cos t = 0
Equation (5) must hold for all real t, so choose several specific values of t (say, t = 0, .1, .2) until you get a system of enough equations to determine that all the cj must be zero.
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