Помогите решить:
1) [tex] \sqrt{2}cos( \frac{3 \pi }{2} -x)-sin( \frac{3 \pi }{4} +x)=0[/tex]
2) [tex]1+sin2x= (cos3x+sin3x)^{2} [/tex]
3) [tex] sin^{4}x+ cos^{4}x= \frac{1}{2} sin^{2} 2x[/tex]
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