If sinx = cos(30°+2x) find the value of sin3x.
Answer & explanation
Correct answer: option 4
If sinx = cos(30°+2x)
(x+30°+2x)=90°
3x = 60°
x=20°
Now, sin3x=sin3×20°
= sin60°
=\(\frac{\sqrt {3}}{2}\)
If sinx = cos(30°+2x) find the value of sin3x.
Correct answer: option 4
If sinx = cos(30°+2x)
(x+30°+2x)=90°
3x = 60°
x=20°
Now, sin3x=sin3×20°
= sin60°
=\(\frac{\sqrt {3}}{2}\)