Problem 43209. Create cosine function out of sine

Solution 1018313

Submitted on 15 Oct 2016 by Marco Tullio

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Test	Status	Code Input and Output
1	Pass	x = 0; y_correct = 1; assert(abs(your_fcn_name(x)-y_correct)<0.01)
2	Pass	x = pi/2; y_correct = 0; assert(abs(your_fcn_name(x)-y_correct)<0.01)
3	Pass	x = pi; y_correct = -1; assert(abs(your_fcn_name(x)-y_correct)<0.01)
4	Pass	x = 3*pi/2; y_correct = 0; assert(abs(your_fcn_name(x)-y_correct)<0.01)