tan 20 + tan 40 + tan 80 – tan 60 = asin 40a = 8 but how?
tan 20 + tan 40 + tan 80 – tan 60 = asin 40
a = 8 but how?
Ellish , 8 Years ago
Grade 11
Trigonometry> tan 20 + tan 40 + tan 80 – tan 60 = asin ...
1 AnswersVikas TU
Last Activity: 8 Years ago
In first two ratios apply
tan(A+B) formulae and in next two terms apply
tan(A-B) formulae.
and then convert it to sin form.
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