Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Explain in one short sentence why
tan
A
=
sin
A
cos
A
\tan A = \dfrac{\sin A}{\cos A}
tan
A
=
cos
A
sin
A
for an acute angle
A
A
A
in a right-angled triangle.
Browse the problem library