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tan 20 + tan 40 + tan 80 – tan 60 = asin 40 a = 8 but how?

tan 20 + tan 40 + tan 80 – tan 60 = asin 40
a = 8 but how?

Grade:11

1 Answers

Vikas TU
14149 Points
6 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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