Question

calculati ctga stiind ca sinaeste egal cu1pe 3 si a apartine(0,pi pe 2)

Answer 1

Mai scrie o data problema, ca sa intelegem

Answer 2

sin a=1/3, a∈cadr.1
cos a=$\sqrt{1- sin^{2}a }= \sqrt{1- \frac{1}{9} } = \frac{2 \sqrt{2} }{3}$
ctga=$\frac{cosa}{sina}= \frac{ \frac{1}{3} }{ \frac{2 \sqrt{2} }{3} } =[tex] \frac{1}{2 \sqrt{2} }$