" 27."x^(x cos x)+(x^(2)+1)/(x^(2)-1)

2cos^(-1)x=cos^(-1)(2x^(2)-1)

If x^(2) + x + 1 =0 , then the value of (x + (1)/(x))^(2) + (x^(2) + (1)/(x^(2)))^(2) + … + (x^(27) + (1)/(x^(27)))^(2) is

((1) / ((sec x) ^ (2) - (cos x) ^ (2)) + (1) / ((cos ecx) ^ (2) - (sin x) ^ (2))) ( cos x) ^ (2) (sin x) ^ (2) = (1- (cos x) ^ (2) (sin x) ^ (2)) / (2+ (cos x) ^ (2) (sin x) ^ (2))

sin[cot^(-1)((2x)/(1-x^(2)))+cos^(-1)((1-x^(2))/(1+x^(2)))]=

sin [ tan^(-1). (1 - x^(2))/(2x) + cos^(-1) . (1-x^(2))/(1 + x^(2))] is

sin [ tan^(-1). (1 - x^(2))/(2x) + cos^(-1) . (1-x^(2))/(1 + x^(2))] is

If x^(2)+x+1=0 then the value of (x+(1)/(x))^(2)+(x^(2)+(1)/(x^(2)))^(2)+...+(x^(27)+(1)/(x^(27)))^(2) is

If x+ (1)/(x)= -1 find x^(27) + (1)/(x^(27)) = ?

sin{tan^(-1)[(1-x^(2))/(2x)]+cos^(-1)[(1-x^(2))/(1+x^(2))]}=