(vii)
cot 54° tan 20°
+
tan 36°cot 70°
-2
Share
(vii)
cot 54° tan 20°
+
tan 36°cot 70°
-2
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Step-by-step explanation:
cot ∅ = tan(90-∅)
so, cot 54° tan 20° + tan 36°cot 70° -2
= cot ( 90- 54) tan (90-20) + tan 36°cot 70° -2
= tan 36° cot 70° + tan 36° cot 70° -2
= 2( tan 36° cot 70°) -2