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Discover Questions

Given, f(x.y) = 10 * (sin(xy) + 1) / (sqrt(x^2+y^2+1)):
a) find a highest direction at point (0,1)
b) tangent line at point (0,1)? Which equations describe (1,9) and (-2,3)? If I took goggles out of the box can I still return it to target? Find the inverse of f(x)= -9 cos(10x+6)? Question number 16 in given pic?