how do you get the -1 function in the corner of the sin, cos, and tan

Always welcome! :D

On the site calculator (and most other calculators as well) press "2nd" then the regular sin, cos, and tan buttons.

For example, if you wanted the arcsin of 1/2, you would enter "2nd", "sin" and 1/2.

Another way would be to enter "asin(1/2)" into the site calculator.

Thanks,  kitty<3 ....!!!