" If "x=c sqrt(b)+4," find "x+(1)/(x)

If x+sqrt(15)=4, then x+(1)/(x)=2(b)4(c)8 (d) 1

If x+\ sqrt(15)=4, then x+1/x= (a)2 (b) 4 (c) 8 (d) 1

If x = 13 + 2sqrt(42) , then sqrt(x) + (1)/(sqrt(x)) is equal to asqrt(b) then find the value of b - a ?

If x = 13 + 2sqrt(42) , then sqrt(x) + (1)/(sqrt(x)) is equal to asqrt(b) then find the value of b - a ?

If x=5+2sqrt(6), then sqrt((x)/(2))-(1)/(sqrt(2x))= (a) 1 (b) 2 (c) 3 (d) 4

If y=sqrt((a-x)(x-b))-(a-b)tan^(-1)sqrt((a-x)/(x-b)), then find(dy)/(dx)

If y = (1)/(1 + x^(a - b) + x^(c - b)) + (1)/(1 + x^(b-c) + x^(a - c)) + (1)/(1 + x^(b - a) + x^(c - a)) then find (dy)/(dx) at e^(a^(b^(c )))

If y = (1)/(1 + x^(a - b) + x^(c - b)) + (1)/(1 + x^(b-c) + x^(a - c)) + (1)/(1 + x^(b - a) + x^(c - a)) then find (dy)/(dx) at e^(a^(b^(c )))

If x = sqrt7 + sqrt6 , then find the simpliest value of (a) x - (1)/(x) , (b) x + (1)/(x) , (c) x^(2) + (1)/(x^(2)) , (d) x^(3) + (1)/(x^(3))