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I know that cos(90) equals zero but my calculator gives .1564. Everything else but trig functions work properly on my calculator. It may be broken or I might have pressed a button the changes the value of trig functions. Does anyone know why my calculator gives this answer?

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    $\begingroup$ Your calculator is in gradients. Change it to degrees. $\endgroup$ – Brent Mar 13 '15 at 0:45
  • $\begingroup$ @Brent The spelling is "gradian", but good observation. $\endgroup$ – Deepak Mar 13 '15 at 0:56
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Your calculator is in radians mode. You need to change it to degrees mode.

Edit: gradians, not radians, but in any event it is not in degrees.

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    $\begingroup$ @Brent's comment was correct. The calculator is in gradians ("Grad") mode. Not radians ("Rad"). Please amend or delete your answer. $\endgroup$ – Deepak Mar 13 '15 at 0:53
  • $\begingroup$ ahh thank you, which button do I press?/what is the symbol for it? I have a casio calculator btw $\endgroup$ – Ray Kay Mar 13 '15 at 1:01
  • $\begingroup$ What's the model number? $\endgroup$ – GFauxPas Mar 13 '15 at 1:02
  • $\begingroup$ fx-82MS I believe $\endgroup$ – Ray Kay Mar 13 '15 at 1:03

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