The value of
2 tan 20
1+tan 4
Answers
Answered by
5
Step-by-step explanation:
tan
−1
(tan(65
0
)−2tan(40
0
))
=tan
−1
(tan(65
0
)−tan(40
0
)−tan(40
0
))
=tan
−1
(tan(65
0
−40
0
)(1+tan(65
0
)tan(40
0
))−tan(40
0
))
Note ...(tan(A−B)(1+tanAtanB)=tanA−tanB)
=tan
−1
(tan(25
0
)+tan(25
0
)tan(65
0
)tan(40
0
)−tan(40
0
))
=tan
−1
(tan(25
0
)+tan(25
0
)cot(25
0
)tan(40
0
)−tan(40
0
))
=tan
−1
(tan(25
0
)+tan(40
0
)−tan(40
0
))
=tan
−1
(tan(25
0
))
=25
0
Answered by
1
Answer:
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