roxanaramirez1 roxanaramirez1

20-02-2018
Mathematics

contestada

If cos(3x)=sin(x+18degrees) what is the value of x

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evgeniylevi evgeniylevi

20-02-2018

Try this option:

1. rule: cosα=sin(90°-α), it means that cos 3x=sin(90°-3x);
2. sin(90°-3x)=sin(x+18°); ⇔ 90°-3x=18°+x; ⇔ x=18°.

Answer: x=18°.

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