school
Acemy

Right Triangles and Trigonometry

SAT Math· difficulty 3/5

If sin⁡(40°)=k\sin(40°) = k, what is cos⁡(50°)\cos(50°)?

  • A

    1k\frac{1}{k}

  • B

    1−k1-k

  • C

    kk

    check_circle
  • D

    1+k1+k

Explanation

cos⁡(90°−θ)=sin⁡θ\cos(90°-\theta)=\sin\theta, so cos⁡(50°)=sin⁡(40°)=k\cos(50°)=\sin(40°)=k.

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forwardPredict my AP score

Related questions

auto_awesomeAll Toolsquestion_answerHomework Q&Amenu_bookAP & SAT PreptimelineLearn Mode