7. (tan x+cot x)² = sec? x+csc² x
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- Find all points with x-values on (0, 2π), where tangent line to the graph of f(x) is horizontal.f(x) = cos(2x) − sin2(x).A rectangle is to be inscribed under the arch of the curve y = 4 cos (0.5x) from x = -pai to x = pai. What are the dimensions of the rectangle with largest area, and what is the largest area?find integral tan 6 x sec 4 x dx