Zhihu, a high-quality Q&A community on the Chinese Internet and an original content platform where creators gather, was officially launched in January 2011 with the brand mission of "allowing people to better share knowledge, experience and insights, and find their own answers." Zhihu relies on seriousness and professionalism. The domain of the tangent function y = tanx is all real numbers not equal to (kπ + π/2), where k is an integer. This is because when x = kπ + π/2, cosx = 0 and tanx = sinx / cosx, so tanx is not defined at this time. Zhihu, a high-quality Q&A community on the Chinese Internet and an original content platform where creators gather, was officially launched in January 2011 with the brand mission of "allowing people to better share knowledge, experience and insights, and find their own answers." Zhihu relies on seriousness and professionalism.
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The image of Y=x is a straight line, in the first and third quadrants, as shown in the figure below: y=x belongs to a linear function. A linear function is a kind of function, generally in the form of y=kx+b (k, b are constants, k≠0), where x is the independent variable and y is the dependent variable. In particular, when b=0.
