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when i do imaging of tissue to look at collagen structure using a 2 photon microscopy, but im not familiarized with the methods to measure the diameter of the collagen and the area occupied by it. Does anyone know how do researchers measure them

how do i take antiderivative of (cosx)^3

Which of the following is an invalid variable name? a: t b: are@ ** c: m_age d: x25 Please check my answer.