Trigonometric Equations 2

1
Trigonometric Equations 2

• Trigonometry

2
Trigonometric Equations
2 Use the formula
Sin2x 2sinxcosx
Cos2x 2cos2x -1
1 2sin2x to solve the
equations on the next slide, for 0 lt x
lt 360, x ? R
3
Examples
1 5sin2x 7cosx 2 3cos2x 10cosx 7
0 3 2cos2x 4sinx 1 0 4 sin2x sinx 5 cos2x
cosx 0 6 5cos2x 11sinx 8 0 7 3sin2x
5cosx 8 2cos2x 9cosx 7 0 9 2cos2x sinx
1 0 10 2sin2x 3sinx 11 3cos2x 7cosx 4
0 12 4cos2x 13sinx 9 0