Grade 11Trigonometry
What is the general solution of tan7x.tan3x=-1? What are its principle solutions?
What is the general solution of tan7x.tan3x=-1? What are its principle solutions?
1 Answer
Arun
we can write it as
sin 7x sin3x + cos 7x cos 3x = 0
hence
cos (7x- 3x ) = 0
4x = 2n* pi ± pi/2
hence
x = npi/2 ± pi/8
Regards
Arun (askIITians forum expert)
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