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cosx^3+secy^3-3axy=0
y'=(x^2sinx^3+ay)/(y^2? secy^3? tany^3-ax)

x? yy '? Is it?

1? cosx^3?

(cosx^3)'=-sinx^3? (x^3)'=-3x^2? sinx^3

2? secy^3?

(secy^3)'=secy^3? tany^3? (y^3)'=3y^2? secy^3? tany^3? hello

3? -3axy?

(-3axy)'=-3ay-3axy '

1(c v)'=c v '

2? (u? v)'=u '? v '

3(u? v)'=u '? v+u? v '

4(u^n)'=n? u^(n- 1)

5? (cos v)'=-sin v

6? (second v)' = second v? Tan? v