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3. cos60' - cot45' + cosec30'/sec60' + tan45' - sin30'
(1/2) - (1) + (2) /(2) + (1) - (1/2)
=[(1-2+4)/2]/[(4+2-1)/2]
=3/5
4.tan45'/cos30' + sec60'/cot45' - 3sin90'/2cos0'
=1/root3/2 + 2/1 - 3/2
=2/root3 + 2/1 - 3/2
=(4 + 4root3 -3root3)/2root3
= 4 + root3 / 2root3
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