GCSE Maths: Sin, Cos and Tan - GCSE.com: revising revision
Tutorials, tips and advice on GCSE Maths coursework and exams for students, parents and teachers. ... You need to know these ratios! The word soh-cah-toa (spoken in a Chinese manner) can help you learn them, or try the mnemonic "Step On His Corns And Hack...