find the value of this
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=(secQ×secQ)-( tanQ×tanQ)+1/tan10.tan20.root3.cot20.cot10
=(sec^2Q-tan^2Q)+1/ tan10. tan20. 1/tan20×1/tan10×root3
=1+1/root3
2/root3
2root3/3
=(sec^2Q-tan^2Q)+1/ tan10. tan20. 1/tan20×1/tan10×root3
=1+1/root3
2/root3
2root3/3
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