SAT Math Practice Question
If $\sin x^{\circ}=a$, which of the following must be true for all values of $x$ ?
- A.$\cos x^{\circ}=a$
- B.$\sin \left(90^{\circ}-x^{\circ}\right)=a$
- C.$\cos \left(90^{\circ}-x^{\circ}\right)=a$
- D.$\sin \left(x^{2}\right)^{\circ}=a^{2}$
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