- How to draw a model 3.14 subtract 1.75?

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Please solve the below captcha question.? How long do hair cells live once clipped? Got no idea. anyone? How many coordinate planes are there in a 4 dimensional Cartesian system? What is the number of coordinate planes of n dimensions? Solve each of the following equations for θ, if 0^°<θ< 〖360〗^°. Do not use a calculator or table:
(a) 2sinθ+√2=0
(b) tanθ=cotθ?