Please solve q 37?

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Answer 1 · 2018-04-25T05:47:32

The solutions are #a in {-1, 1}#

#2sintheta=a+1/a#

Therefore,

#sintheta=1/2(a+1/a)#

But,

#-1<=sintheta<=1#

so,

#-1<=1/2(a+1/a)<=1#

#-2<=(a+1/a)<=2#

The solutions are #a in {-1, 1}#