1.

The value of tan70°.tan20°.tan90°​

Answer»

ANSWER :. 1

Explanation:. tan70' × TAN20' × tan90'

= cot(90' - 70') × tan20' × 1

= cot20' × tan20'

= cos20'/sin20' × sin20'/cos20'

= 1 × 1

= 1



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