`3(1)/(5)+1(2)/(3)` is equal to

If the sum of first 15 terms of series ((4)/(3))^(3)+(1(3)/(5))^(3)+(2(2)/(5))^(3)+(3(1)/(5))^(3)+4^(3) is equal to (512)/(2)k then k is equal to:

(1)/(2)+(2)/(5)+(3)/(4) is equal to

(5 (9)/(14))/(5 + (3)/(3 + (1)/(3/5) )) is equal to

"sin"^(-1)(4)/(5)+2"tan"^(-1)(1)/(3) is equal to

1(2)/3 xx 1(3)/5 is equal to

Let x=(2+sqrt(5))^((1)/(3))+(2-sqrt(5))^((1)/(3)),x^(3)+3x is equal to

sin[3sin^(-1)((1)/(5))] is equal to