Select cos-1

`↑ Shift` + `O`

All hotkeys for Windows Calculator

General Switch to Standard mode	`Alt` + `1`
General Switch to Scientific mode	`Alt` + `2`
General Switch to Programmer mode	`Alt` + `3`
General Store in memory	`Ctrl` + `M`
General Add to memory	`Ctrl` + `P`
General Subtract from memory	`Ctrl` + `Q`
General Recall from memory	`Ctrl` + `R`
General Clear memory	`Ctrl` + `L`
General Clear current input (select CE)	`Del`
General Fully clear input (select C)	`Esc`
General Select ±	`F9`
General Select 1/x	`R`
General Calculate the square root	`@`
General Turn calculation history on or off	`Ctrl` + `H`
General Move up in history list	`↑`
General Move down in history list	`↓`
General Clear history	`Ctrl` + `↑ Shift` + `D`
Programmer mode Select WORD	`F3`
Programmer mode Select BYTE	`F4`
Programmer mode Select HEX	`F5`
Scientific mode Select 10x	`Ctrl` + `G`
Scientific mode Select cosh	`Ctrl` + `O`
Scientific mode Select sinh	`Ctrl` + `S`
Scientific mode Select tanh	`Ctrl` + `T`
Scientific mode Select sin-1	`↑ Shift` + `S`
Scientific mode Select cos-1	`↑ Shift` + `O`
Scientific mode Select tan-1	`↑ Shift` + `T`
Scientific mode Select y?x	`Ctrl` + `Y`
Scientific mode Select Mod	`D`
Scientific mode Select log	`L`
Scientific mode Select dms	`M`
Scientific mode Select ln	`N`
Scientific mode Select ex	`Ctrl` + `N`
Scientific mode Select cos	`O`
Scientific mode Select Pi	`P`
Scientific mode Select x2	`Q`
Scientific mode Select sin	`S`
Scientific mode Select tan	`T`
Scientific mode Select F-E	`V`
Scientific mode Select Exp	`X`
Scientific mode ^ Select xy	`Y,`
Scientific mode Select x3	`#`
Scientific mode Select Int	`;`
Scientific mode Select n!	`!`
Programmer mode Select DWORD	`F2`
Programmer mode Select DEC	`F6`
Programmer mode Select OCT	`F7`
Programmer mode Select BIN	`F8`
Programmer mode Select QWORD	`F12`
Programmer mode Select A-F	`A` + `F`
Programmer mode Select RoL	`J`
Programmer mode Select RoR	`K`
Programmer mode Select Lsh	`<`
Programmer mode Select Rsh	`>`
Programmer mode Select Mod	`%`
Programmer mode Select Or	`\|`
Programmer mode Select Xor	`^`
Programmer mode Select Not	`~`
Programmer mode Select And	`&`
Programmer mode Toggle the bit value	`Space`