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.
Bring a new dimension of learning to your classroom with activities that put math in motion.
Explore teaching strategies to help students succeed on the SAT® and ACT® math tests using TI technology.
Drive deeper, more relevant understanding of science in middle grades and high school.
TI Connect™TI Connect™ CE
Students will verify, prove, and explore trigonometric identities symbolically, numerically, and graphically.
Students will use the VERITRIG program to help prove the two trigonometric identities. They will use the Text tool to label a triangle drawn within the unit circle. Then students will write x and y in terms of cosθ and sinθ to prove the identity cos2θ + sin2θ = 1.
Students then prove the identity sec2θ = 1 + tan2θ using similar triangles and ratios.
After proving the identities, students can use the cosine and sine values of the angles in the unit circle to prove that the proof holds for each identity.
© Copyright 1995-2020 Texas Instruments Incorporated. All rights reserved.