5. `cos^(2)(125^(0)-x)-cos^(2)(55^(0)+x)`= `(1) -1` `(2) 0` `(3) 1` `(4) 2`

cos^(2)(125^(@)-x)-cos^(2)(55^(@)+x)=

(cos^(2)1^(0)-cos^(2)2^(0))/(2sin3^(0)*sin1^(0)) is equal to

cos24^(@)+cos55^(@)+cos125^(@)+cos204^(@)=1)-1quad 2)0 33)14)2

6cos^(3)x+cos^(2)x-1=0

Value of (1-(cos61^0)/(cos1^0))*(1-(cos62^0)/(cos2^0))*(1-(cos63^0)/(cos3^0)) .......... *(1-(cos119^0)/(cos59^0)) (a) -1 (b) 1 (c) 2 (d) -2

lim_ (x rarr0) (cos ^ (2) ((1-cos ^ (2)) (1-cos ^ (2) (... * cos ^ (2) (x)))))) / (sin [ pi ((sqrt (x + 4) -2) / (x))])

lim_(xrarr0)(1-cos(2x))/x^(2) = 0.

Let x=sin1^(0), then the value of the expression.(1)/(cos0^(0)cos1^(0))+(1)/(cos1^(0)cos2^(0))+(1)/(cos2^(0)cos3)+(1)/(cos44^(0)cos45^(@)) is equal to (a) x (b) (1)/(x) (c) (sqrt(2))/(x) (d) (x)/(sqrt(2))

If quad cos^(-1)(2x)+2cos^(-1)sqrt(1-4x^(2)),-(1)/(2)