For the first derivative of f(theta)=2cos(theta)+cos^2(theta),
i got
f'(theta)=-2sin(theta)+2cos(theta)- sin(theta)=0
after simplifying it, the book had
(-sin(+cos(theta))=0 how did they get (1+cos( the answers is prob really simple but i am stuck on it if anyone could kindly . @mathematics

answer: 298143

step-by-step explanation:

pentagon

step-by-step explanation:

the coordinates   a(5, -2), b(3,-1),c(-4,-4) d(-3,8) and e(-1,4) forms the vertices of the polygon when they are connected in order.

in order to classify that which polygon is it with the given coordinates, first count the number of vertices and then count the number of sides it can make with these vertices.

since, the given coordinates have five vertices, therefore, it will make five sides. moreover, pentagon is regular in nature therefore it will be convex.

now, a polygon with five sides is known as pentagon, therefore, the given polygon is the pentagon.