Find where to buy the TI-84 Plus CE graphing calculator in a variety of bold, fun colors.
Download free 90-day trial versions of the most popular TI software and handheld emulators.
Explore lessons that cover essential, foundational mathematics concepts.
Enhance your teaching with a hands-on learning experience.
We are here to help with distance learning resources for schools and districts.
Update OS, transfer files andtake screen captures for yourTI-Nspire™ CX II graphing calculator.
Students use graphs to verify the reciprocal identities. They then use the calculator's manual graph manipulation feature to discover the negative angle, cofunction, and Pythagorean trigonometric identities.
In problem 1, students will investigate the idea that two functions are equal if their graphs are exactly the same.
Students will also investigate the reciprocal of an identity. Students should se that a reciprocal identity shows that one trigonometric function is equal to the reciprocal of another.
In problem 2, students further explore negative angle identities.
Students see will observe two ways to translate sin(x) to make it line up with sin(–x). They will see that setting both functions to be equal to each other they will get sin(–x) = –sin(x).
Problem 2 gives students the opportunity to explore cofunction identities. They will see that sine and cosine functions are similar to each other, as compared to the tangent function.
Students graph sin(x) and cos(–x). Students will learn that the idea of sine and cosine being similar can be formalized by the cofunction identities.
© Copyright 1995-2021 Texas Instruments Incorporated. All rights reserved.