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equation with sign question

Please see attatched :biggrin:
e with sin.png14.7KB
Yes, cos is an even function so cos(-x) = cos(x). So instead of that sign swapping from plus to minus on the RHS, it would stay plus, but the minus sign from inside the brackets would go, i.e:

a + cos(-pi b) = a + cos(pi b).

Yes, as tan is also an odd function, that equality would also hold for tan.
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CasualSoul
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Original post by claret_n_blue
Yes, cos is an even function so cos(-x) = cos(x). So instead of that sign swapping from plus to minus on the RHS, it would stay plus, but the minus sign from inside the brackets would go, i.e:

a + cos(-pi b) = a + cos(pi b).

Yes, as tan is also an odd function, that equality would also hold for tan.


Hey thanks I understand it better now- you explained that really well !:biggrin:

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