Asked by elise
Use the cofunction identities to evaluate the expression below
sin^2 21° + sin^2 61° + sin^2 69° + sin^2 29°
sin^2 21° + sin^2 61° + sin^2 69° + sin^2 29°
Answers
Answered by
Scott
2
sin(21º) = cos(69º)
sin(29º) = cos(61º)
so it's twice sin² + cos²
sin(21º) = cos(69º)
sin(29º) = cos(61º)
so it's twice sin² + cos²
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