Please solve the exercises 7 and 8. Thank you!

Ohs. (10 puts) (5 pots ) BocE (c) f(x) = (x2 +31 - 10) () - 1+ secx (d) f(x)=21-12-3 (e) y - cott emc I Show that y = 23 + 3x + 1 satisfies y" + xy" - 2y' = 0. (10 puts) Find the equation of the tangent line to the graph of r3 + y' = gry at the point (2,4). Find the equation of the tangent line to the graph of f(x) = That r = -1.(10 puts) . Use the product rule twice to prove that if f, g and h are differentiable, then 9. (fgh)' = f'gh + fg'h+ fgh' (5 pnts) . Taking f = g = h in the previous part, show that d