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cos 4x – sin2x = 0 ? Trigonometry?

its NOT cos^4x or sin^2xdomain: 0 to 2pi or 0 to 360 degreesPlease in step by step explain how to get theanswers : 15, 75, -45……all in degrees thank you.

2 Answers

A
Alycia Zemlak

Feb 20, 2025

1- 2(sin2x)^2 – sin2x = 0—>2(sin2x)^2 + sin2x – 1 = 0(sin2x +1)(2sin2x – 1) = 0 sin2x + 1 = 0—>sin2x = -1 —> 2x = 270, 630 —>x = 135, 3152sin2x – 1 = 0 —> sin2x = 1/2 —>2x = 30, 150, 390, 510—> x = 15, 75, 195, 255... Show More

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