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Right Triangles and Trigonometry

SAT Math· difficulty 3/5

If cos⁡(20°)=k\cos(20°)=k, what is sin⁡(70°)\sin(70°)?

  • A

    1+k1+k

  • B

    1k\frac{1}{k}

  • C

    1−k1-k

  • D

    kk

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Explanation

sin⁡(70°)=cos⁡(90°−70°)=cos⁡(20°)=k\sin(70°)=\cos(90°-70°)=\cos(20°)=k.

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