Sarah Kim

This page lists questions and answers that were posted by visitors named Sarah Kim.

Questions

The following questions were asked by visitors named Sarah Kim.

how can you confirm the identity cos^4x = (1/8)(3+ 4cos2x+ cos4x) and sin4x = (4sinxcosx)(2cos^2x-1)
16 years ago

Answers

The following answers were posted by visitors named Sarah Kim.