Why don't my iPhone calculator and graphing calculator calculate sin, cos, and tan correctly? Is there a way to fix this, and if so, how?

Guest Jun 12, 2017

Maybe you need your answers given in radians instead of degrees, or degrees instead of radians?

The graphing calculator should have a setting to put it in degree mode or radian mode.


If you can't find the setting, you can convert from degrees to radians by multiplying by   π / 180

( And you can convert from radians to degrees by mutiplying by   180 / π ).

hectictar  Jun 12, 2017

What type of calculator are you using? Knowing this information will make it easier to diagnose the problem and fix it.

TheXSquaredFactor  Jun 13, 2017

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