the value of `sqrt(1-sin^2 11 0^(@))*sec11 0^(@)`

The value of sin^2(1^@)+sin^2(5^@)+sin^2(9^@)+..........+sin^2(89^@) is (A) 11frac(1)(2) (B) 11sqrt2 (C) 11 (D) frac(11)(sqrt2)

The value of sqrt(0.121) is (a) 0.011(b)0.11(c)0.347(d)1.1

The simplified value of sqrt((1.21 xx 0.9 )/(1.1 xx 0.11 )) is -

Find the value of (sqrt11 + sqrt7) (sqrt11 -sqrt7)