Evaluate : (cos 65°/sin 25°) - (tan 20°/cot 70°) - sin 90° + tan 5° tan 35° tan 60° tan 55° tan 85°.
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(sin(90-65)/sin25) - (cot(90-20)/cot70°) - 1 + tan5 tan85 tan 35 tan 55 tan 60
=1 - 1 -1 + 1×1×√3
= -1+√3
=1 - 1 -1 + 1×1×√3
= -1+√3
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