Answer:
5 x k = 15 + 3 = 18
Step-by-step explanation:
k=3
This is the concept of trigonometry, the value of x will be calculated as follows;
sin theta=[opposite]/[hypotenuse]
theta=x
opposite=16 units
hypotenuse=21 units
thus;
sin x=16/21
hence;
x=arcsin(16/21)
x=49.63
x=50 (to the nearest degrees)
Answer:
25.12
Step-by-step explanation:
the formula of a cone is pi r^2 * h/3
r = radius and h = height
the radius is 2 and the height is 3
and the question says use 3.14 instead of pi so
we have
3.14 * 2^2 * 6/3
2*2 or 2^2 = 4
3.14 * 4 * 6/3
6/3 = 2
3.14 * 4 * 2
4*2 = 8
and 8 * 3.14 is 25.12
Step-by-step explanation:
here's the answer to your question
Answer: -2sin³x
Step-by-step explanation:
cos ( x + y ) = cosx*cosy - sin y*sinx (1)
if x = y (1) could be express as: cos (2x) = cosx*cosx -sinx*sinx
cos 2x = cos²x -sin²x
Then sin(x)*cos2(x) − sin(x) ⇒ sinx * ( cos²x - sin²x ) - sinx
multiplying sinx*cos²x -sin³x -sinx
sinx (commom factor sinx (cos²x -sin²x -1) but 1-cos²x = sin²x
or -1 +cos²x = -sin²x ⇒sinx( -sin²x -sin²x) ⇒sinx (-2sin²x)
-2sin³x
