If two circles of radii 18 cm and 8 cm touch externally, then the length of a direct common tangent is:

$${1+sinθ}\over cosθ $$ is equal to which of the following (where $$θ ≠ {π\over2} $$

if $${x\over 9}+{8\over x}=1$$, then the value of x³ is :

△ABC is right-angle triangle at B and tan A = $$3\over 4$$, then sin A + sin B + sin C will be equal to:

What is the value of a²+b²+c²-2ab-2bc+2ca?

Raju, Shobha and Mohan can do a work in 15 days, 20 days and 25 days respectively. In how many days, will the work be finished, if they do it on alternate days?

if $$a+{1\over a}=5$$, then what is the value of $$a^3+{1\over a^3}$$

What is the rate of interest per annum for simple interest at which Rs.880 amounts to Rs.913 in $$1{1\over 2}$$years?