Giải các phương trình lượng giác sau:
1. $\left | sinx-cosx \right |+4sin2x=1$
2. $5cos3\left ( x+\frac{\pi }{6} \right )+3cos5\left ( x-\frac{\pi }{10} \right )=0$
3. $cos^{3}x.cos3x+sin^{3}x.sin3x=\frac{\sqrt{2}}{4}$
4. $4^{sinx}-2^{1+sinx}.cos(xy)+2^{\left | y \right |}=0$
5. $8cos4x.cos^{2}2x + \sqrt{1-cos3x}+1=0$
6. $\sqrt[4]{4sin^{2}x-4sinx+2}+\sqrt{8sin^{2}x-8sinx+11}=1-12sin^{2}x+12sinx$
7. $sin2x(cosx+3)-2\sqrt3 cos^3x-3\sqrt3 cos2x+8(\sqrt3 cosx-sinx)-3\sqrt3 =0$
8. $4sinx.sin\left ( \frac{\pi}{3}+x \right ).sin\left ( \frac{\pi }{3}-x \right )-4\sqrt{3}cosx.cos\left ( \frac{\pi }{3}+x\right ).cos\left ( \frac{2\pi }{3}+x \right )=2$
Edited by chelsea112013, 01-05-2013 - 18:37.