[" Exact value of "cos ec10^(0)+cos ec50^(0)],[-cos ec70^(0)=]

Find the exact value of cos ec10^(@)+cos ec50^(@)-cos ec70^(@)

Find the exact value of cos ec10^(@)+cos ec50^(@)-cos ec70^(@)

cos ec31 ^ (@) - sec59 ^ (@)

cos ec15 ^ (@) + sec15 ^ (@)

cos48^(@)cos23^(@)cos ec42^(@)cos ec67^(@)=1

cos ec15 ^ (@) + sec15 ^ (@) =

int cos ec^(3)xdx

int cos ec^(3)xdx

int cos ec^(4)xdx

If 2<=a<3, then the value of cos^(-1)cos[a]+cos ec^(-1)cos ec[a]+cot^(-1)cot[a] (where [.] denotes greatest integer less than equal to x ) is equal to