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find the expression cot9+cot27+cot63+cot81
In this case u need grouping. => (cot 9° + cot 81°) + (cot 27° + cot 63°)Convert cot to sin and cos => [(cos 9° / sin 9°) + (cos 81° / sin 81°)] + [(cos 27° / sin 27°) + (cos 63° / sin 63°)] Using cross-multiplication,=>[(sin 81° . cos 9° + cos 81° . sin 9°)/(sin 9° . sin 81°)] + [(sin 63°. cos 27° + cos 63° . sin 27°)/(sin 27° . sin 63°)] Solving it, u will get the answer as 4√5.
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