2
sin(21º) = cos(69º)
sin(29º) = cos(61º)
so it's twice sin² + cos²
Use the cofunction identities to evaluate the expression below
sin^2 21° + sin^2 61° + sin^2 69° + sin^2 29°
1 answer
sin^2 21° + sin^2 61° + sin^2 69° + sin^2 29°
1 answer
1 answer
1 answer
2 answers
1 answer