Hi, I am trying to find the Inverse Tangent, Cosine and Sine symbol in the Scientific Calculator of my Braillenote Apex, which has the serial number 650320002485. However, I can't seem to find it. My aide called about an hour ago and was told that in order to do these symbols, you hold down the negative sign and do the tangent, cosine or sine symbol. When I tried that, it didn't work. It only gave me negative tangent, cosine and sine. I know that tangent, cosine and sine are found by pressing t and t, t and c, and t and s in KeyPlus. Can you please give me a step-by-step procedure, if there's any, on how to do the inverse of these symbols? Thank you. Please reply as soon as possible. Sincerely, Carlos
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