Simplify [(4/5)^-1 - (4/5)^-2]^-1/2
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=>[(5/4)-(5/4)(5/4)]^-1/2.
=>[(5/4)(1-5/4)]^-1/2.
=>1/[5/4*(-1/4)]^1/2.
=>since negative inside the root soln is imaginary;
=>1/i(5/16)^1/2.
=>1/i(_/5/4)=4/_/5i.
(_/5 means root 5)
=>[(5/4)(1-5/4)]^-1/2.
=>1/[5/4*(-1/4)]^1/2.
=>since negative inside the root soln is imaginary;
=>1/i(5/16)^1/2.
=>1/i(_/5/4)=4/_/5i.
(_/5 means root 5)
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