Question

given sin theta=4/5 with 90 dgreess less than or equal to thata less than or equal to 180 degress

find exact value of : sin theta/2

Answer 1

\[\sin \theta=\ 4/5 \ with 90 degreess\] =\[180 degreess \]
so its 1:2

Answer 2

huh?

Answer 3

ok

Answer 4

u=(2 cos pi/4)i + (2 sin pi/4)j, v = (cos 3pi/2)i + (sin 3pi/2)j find the angle theta .... If sin theta equals two third and zero degrees less than theta less than 90

Answer 5

ok

tnaks

Answer 6

yes i need help

Answer 7

sin theta = 4/5 = 0.8
sin^-1 theta = 53.13010235 degrees
sin (53.13010235/2) = 0.447213595

Answer 8

no but not indecimals

Answer 9

do it in a graph

Answer 10

I have the answer:
sin (theta/2) = Square root (1/5)
Do you want to know the method?

Answer 11

The length of the remaining side of the triangle is:
square root of (5^2 - 4^2) = 3
Then use the formula for the sine of the half angle:
sin (theta/2) = square root (((s - b)(s - c))/bc))
Where s = 1/2(a + b + c)