Add sincostau

[devmotion]

Fixes #39.

[codecov]

Codecov Report

Base: 100.00% // Head: 91.66% // Decreases project coverage by -8.34% ⚠️

Coverage data is based on head (db2b098) compared to base (d2fd316).
Patch coverage: 87.50% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #45      +/-   ##
===========================================
- Coverage   100.00%   91.66%   -8.34%     
===========================================
  Files            1        1              
  Lines            4       12       +8     
===========================================
+ Hits             4       11       +7     
- Misses           0        1       +1     

Impacted Files	Coverage Δ
src/Tau.jl	91.66% <87.50%> (-8.34%)	⬇️

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