You can also plot graphs for trigonometric equations (equations that use sine, cosine ... the ‘2 nd ’ button, which opens the second group of available buttons on the calculator.

just as you would find on a real physical scientific calculator. This mode provides all the buttons found in Basic mode, but it also adds memory, squaring, random, logarithmic, sine/cosine/tangent ...

frac{4^2 + 6.9^2 - 4.2^2}{2 \times 4 \times 6.9}\) \(\cos{y} = 0.8327898 \dotsc\). Do not round this answer yet. To calculate the angle use the inverse cos button on the calculator (\(\cos^{-1}\)).

Go ahead and grab your calculator. Make sure your calculator is in radians mode and then type in 7.07 and press the "cos" button. Yes, it's going to output something like 0.706104. But how does it ...