If tan7A . tan 3A =1. Then find the value of A
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Answer:
A=9°
Step-by-step explanation:
tan7A. tan 3A =1
tan 7A= 1/tan3 A
tan 7A= cot 3A
cot(90-7A)= cot 3A
90-7A= 3A
=. 10A = 90
A=9°
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Forum Trigonometry If tan 3A * tan 2A = 1 then what is the...
If tan 3A * tan 2A = 1 then what is the value of À?
Soniya, 3 years ago
Grade:10
1 Answers
Arun
25763 Points
3 years ago
Dear Soniya
tan 3A * tan 2A = 1
sin 3A sin2A = cos 3A cos 2A
Sin 3A sin2A - cos 3A cos 2A = 0
sin (3A -2A) = 0
Sin A = 0
Hence
A = 0°
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