Forum - Trigonometry

Tangent and cotangent

Johana
Visitor
2016-01-20 14:43:14
#1
If tg a + ctg a = 9 then sin 2a =?

 

RE: Tangent and cotangent

MariusP
Visitor
2016-01-20 14:48:51
#2
We know that tg x =sin x / cos x

ctg a = cos a / sin a

According the formula

you can find it herehttp://mathematicshelp.org/maths/posts/content/39

we have:


sin 2a = 2/9

 
 

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