NotesFAQContact Us
Collection
Advanced
Search Tips
50 Years of ERIC
50 Years of ERIC
The Education Resources Information Center (ERIC) is celebrating its 50th Birthday! First opened on May 15th, 1964 ERIC continues the long tradition of ongoing innovation and enhancement.

Learn more about the history of ERIC here. PDF icon

Showing all 2 results
Proof without Words: Monotonicity of sin x/x on (0, pi/2)
Peer reviewed Peer reviewed
Direct linkDirect link
Li, Xiaoxue H. – College Mathematics Journal, 2013
A visual proof that sin x/x is monotonically increasing on (0, pi/2). For tan x/x, see p. 420 (EJ1017686).
Descriptors: College Mathematics, Mathematical Logic, Validity, Mathematical Concepts
Proof without Words: Monotonicity of tan x/x on (0, pi/2)
Peer reviewed Peer reviewed
Direct linkDirect link
Li, Xiaoxue H. – College Mathematics Journal, 2013
A visual proof that tan x/x is monotonically increasing on (0, pi/2). For sin x/x, see p. 408 (EJ1017684).
Descriptors: College Mathematics, Mathematical Logic, Validity, Mathematical Concepts