Asked by Raj

Given that sinA=2/5 and that A is obtuse,find the value of cosA.
Answered by oobleck
sinA = 2/5, so
cosA = √21/5
But A is in QII, so cosA = -√21/5
Answered by Raj
Why not sqrt(5^2-2^2)/5 ?
There are no AI answers yet. The ability to request AI answers is coming soon!