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4. Solve the following equations using any method from the course so far (indicating clearly What method you are using). ax'x2=2 ar:5 () y y y (b) y' + ln(m) (1 + y) = 0, 31(1) = 0 (c) 2 y/cos(:c) y (1 sin2(x)) y sin(m) = cos(x) y