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[" TH "tan theta+(1)/(tan theta)=2cos2ta...

[" TH "tan theta+(1)/(tan theta)=2cos2tan^(2)theta+(1)/(tan^(2)theta)],[[" (a) "3," (b) "2," (c) "1," (d) "0]]

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tan theta+(1)/(tan theta)=2 then prove that tan^(2)theta+(1)/(tan^(2)theta)=2

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(tan theta)/(1+cot theta)=(tan theta-1)/(2-cos ec^(2)theta)