tan 9° cot 27° - cot 81° tan 63
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Answer:
tan81+tan9−(tan63+tan27)
=cot9+tan9−(cot27+tan27)
=sin9.cos9(cos9)2+(sin9)2−sin27.cos27(cos27)2+(sin27)2
=sin9.cos91−sin27.cos271
=2 sin/18−2sin/54
=2.sin54.sin18/sin54−sin18
=cos36.sin18/4cos36sin18
=4
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