- Need quick solution.?

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Find the average score of female students? By first expanding sin(2x+x), prove that sin3x=3sinx-4sin^3x? The path the sun takes around the celestial sphere is called the - and is a product of Earth's revolution around the Sun.? Find the points on the curve at which r(t) and r(t)′ are perpendicular. r(t)=(5t)a+(1+t^2)b
r'(t)=(5,2t) How do I do it :(? Cant get on skypewhy?