Hi so i have to use the cos, sin , and tan

Oct 04, 2009

- Please tell me exactly what you are try to calculate, or graph. Describe the key strokes.Some variables are LOCKED system variables, others are Locked apps variables. Here are some system variables. Notice the lock icon to the left.


To view the variables and their status, use [2nd][VAR-LINK] [F2:View]


Option 1 allows you to view general variables that have been defined, 2: the variables that belong to the apps, and 3: the system variables of which the first screen displays some. If all fails, reset the RAM.

Oct 04, 2009

- Here are screen shots of numerical calculations with sine and cosine. Notice that if there is a decimal point in a number, the value is given in approximate decimal form. If no decimal point is entered result is exact.

Oct 08, 2009

- Press [2nd][MEM][7:Reset][1:ALL RAM][2:RESET] [ENTER]
Memory cleared appears on screen.
If your angles are in degrees you should make sure calculator is configured correctly. Press [MODE] Here is what you see on my calculator.


Everything in white-on-black has been selected. If you work in radians, screen should be as above. But if you work indegrees, highlight degrees and press [ENTER]



You said above that you press [2nd] then the function. No. To calculate the trigonometric functions you enter them directly.

[TAN]35 [)] [ENTER] gives 0.7002075382. Do not forget the closing parenthesis.

[SIN] 180/3 [)] ENTER gives 0.8660254038. Do not forget )

[COS] [(-)] 57.065 [)] ENTER . The minus is the change sign next to the enter key. Do not forget the )


Hope it helps.