(ii) sin 50^ cos 40^ + cosec 40^ sec 50^ -4 cos 50^ cosec 40 degrees +2 = 0
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sin2 34° + sin2 56°+ 2 tan 18° tan 72°- cot2 30°
=sin2 34° +sin2(90° - 34°)+2 tan 18° tan (90° - 18°) - cot2 30°
=sin2 34°+cos2 34° + 2 tan 18° cot 18°(root 3)^2
=1 +2 tan 18° × 1/ tan 18° - 3
= 1+2-3
=0
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