Prove that cot105°-tan105°=2√3
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Answer:
cot105 - tan105 = 1/tan105 - tan105
tan 105 = tan (60+45) = tan 60 + tan 45 / 1 -tan60tan45
= √3 + 1 / 1 - √3
so ans = 1 / (√3 + 1/ 1-√3) - √3 + 1/1 - √3
= 1 - √3 / 1 + √3 - 1 + √3 / 1 - √3
= (1-√3)² - (1+√3)² / 1 -3 = 1+3 -2√3 - (1+3+2√3) / -2
= -4√3 / - 2= 2√3
Hence proved. Hope this helps.
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