Question

tan23-tan51-tan39-tan67
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Answer 1

Answer:

tan 23 - tan ( 90 - 23 ) - tan 51 - tan ( 90 - 51 )

= tan 23 - cot 23 - tan 51 - cot 51

= tan 23 * 1/ tan 23 - tan 51 * 1/ tan 51

= 1 - 1

= o

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