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option d none of these
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tan9 - tan27 - tan63 + tan81
tan(90-81) - tan(90-63) - tan63 + tan81
cot81 - cot 63 -tan 63 +tan81
1 +1
2
tan(90-81) - tan(90-63) - tan63 + tan81
cot81 - cot 63 -tan 63 +tan81
1 +1
2
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