tan 80 × tan 70 × tan 60....... ×tan 10
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Answer: 1
Step-by-step explanation:
tan80 x tan 70 x .....x tan10
= (tan80 x tan10)(tan70 x tan20)(tan60 x tan30)(tan50 x tan40)
=(tan80 x cot80)(tan70 x cot70)(tan60 x cot60)(tan50 x cot50)
= 1
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