a^2=5/9
is it??
was solving a ques..and found this in b/w....and cant solve this step...
for x=-1/2
find value of a^2 if a =cos tan-1 sin cot -1 x
-
UP 0 DOWN 0 0 6
6 Answers
eureka123
·2009-11-24 11:09:00
soln plzz
no hints....plz full soln...i know it wont be longer than 3-4 lines...or even shorter than that
Arshad ~Died~
·2009-11-24 11:18:03
a=cos tan-1 sin cot -1 x
a=cos tan-1 sin sin -1(1/√(1+x2))
a=cos tan -1(1/√(1+x2))
a=cos cos -1 (1/√(1+(1/1+x2))
so
a=√((1+x2)/(2+x2))
now put x=-1/2
and get the ans