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Grade: 11

                        

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

4 years ago

Answers : (1)

Vikas TU
12126 Points
							
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.
4 years ago
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