помогите пожалуйста:
1. 2cos(x+пи/3)= <span>-√3</span>
<span>2. 2sin(x+пи/6) = <span>-√3</span></span>
<span><span>3. 1/3sin x/4 = <span>√2/6</span></span></span>
<span><span><span>4. cos<span>²x - sin<span>²x = -1</span></span></span></span></span>
<span><span><span><span><span>5. tg(пи+x) + 2tg x - √3=0</span></span></span></span></span>
<span><span><span><span><span>6. tgx/sin2x=0</span></span></span></span></span>
<span><span><span><span><span>7.2sin²x - 3cos x =3</span></span></span></span></span>
<span><span><span><span><span>8. 2sin²x+sinx -3 = 0</span></span></span></span></span>