Question

If sin(x) = 0.28, what is cos(90° - x)

Answer 1

`\bf \textit{Cofunction Identities} \\\\ sin\left((\pi)/(2)-\theta\right)=cos(\theta) \qquad cos\left((\pi)/(2)-\theta\right)=sin(\theta) \\\\\\ tan\left((\pi)/(2)-\theta\right)=cot(\theta)\qquad cot\left((\pi)/(2)-\theta\right)=tan(\theta) \\\\\\ sec\left((\pi)/(2)-\theta\right)=csc(\theta)\qquad csc\left((\pi)/(2)-\theta\right)=sec(\theta)`

therefore, sin(x) = cos(90° - x).