24soln plzz
no hints....plz full soln...i know it wont be longer than 3-4 lines...or even shorter than that
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
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6 Answers
24
1a=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