Add trigonometric functions & more#2

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d-srd wants to merge 27 commits intoadvantagefse:masterfrom

Commits on Jul 22, 2019

add a sin expression
Dino Srdoč
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add sin to parser
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add sin tests
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add array parsing to sin
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add more sin tests
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add cos tests
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add implementation of cos
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cos of pi is actually -1, not 1
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add cos to parser
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indent test rule set
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add tan tests
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do not assume maths is equal to programming
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add tan and use it in the parser
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add rounding tests
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add a rounding expression
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add round to parser
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dont expect integers as output of round
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add more tests
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add even more tests
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add tests for casting strings to numbers
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add invalid test cases
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add one more valid test case
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implement casting to numbers
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add casting to parser
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use correct assert methods
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[Merge additional-functions] make sure to not return an empty array, but a .null
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bump pod version
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