Problem 43213. Create tangent function out of sine function only

Solution 1667458

Submitted on 7 Nov 2018 by li haitao

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Test	Status	Code Input and Output
1	Pass	filetext = fileread('TANGENT.m'); assert(isempty(strfind(filetext, 'tan')),'tan() forbidden') assert(isempty(strfind(filetext, 'cos')),'cos() forbidden')
2	Pass	x = 0; y_correct = 0; assert(abs(TANGENT(x)-y_correct)<0.01)
3	Pass	x = pi/4; y_correct = 1; assert(abs(TANGENT(x)-y_correct)<0.01)
4	Pass	x = -pi/4; y_correct = -1; assert(abs(TANGENT(x)-y_correct)<0.01)