Trigonometric Substitution
Use trigonometric identities to help integrate special forms of radical functions.
Real World
Find out how photo editing software uses integrals of trigonometric functions to blur images.
AI Teacher ToolsTry it now!
Math
FlexLets
Adult Education
EXPLORE
FlexiA FREE Digital Tutor for Every Student
FlexBooks 2.0Customizable, digital textbooks in a new, interactive platform
FlexBooksCustomizable, digital textbooks
SchoolsFlexBooks from schools and districts near you
Study GuidesQuick review with key information for each concept
Adaptive PracticeBuilding knowledge at each student’s skill level
SimulationsInteractive Physics & Chemistry Simulations
PLIXPlay. Learn. Interact. eXplore.
CCSS MathConcepts and FlexBooks aligned to Common Core
NGSSConcepts aligned to Next Generation Science Standards
Certified EducatorStand out as an educator. Become CK-12 Certified.
WebinarsLive and archived sessions to learn about CK-12
