2.tan20-tan800+ 3 tan20tan800=1에4)2) 31) 33) - 13 – InterviewSolution

1.

2.tan20-tan800+ 3 tan20tan800=1에4)2) 31) 33) - 13

Answer»

Step-by-step EXPLANATION:

tan20-tan(360+440)+3tan20tan(360+440)

tan20-cot440+3tan20cot440

=tan20-cot(360+80)+3tan20cot(360+80)

=tan20-tan80+3tan20tan80

=tan20-tan(90-10)+3tan20tan(90-10)

=tan20-cot10+3tan20cot10

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