Question

use double angle identities
2 sin75^0 cos 75^0

Answer 1

I have sin 2x = sin2(75) cos(75)

Answer 2

i don't know how to edit

Answer 3

i have sin 150 but i don't know what to do with cos75

Answer 4

hey, sin 2x = 2sinx cos x

Answer 5

what did i do wrong?

Answer 6

2(75) cos(75)

Answer 7

you miss 2 before sin x cos x

Answer 8

ok, Madina, You wrong at the beginning , You have the form already , you have 2 sin 75 cos 75 = sin 2*75= sin 150 . look up the value of sin 150 plug there and you got the answer

Answer 9

\[-\sqrt{3}/2\]

Answer 10

cannot be that, 150 at quadrant 2, sin in that region cannot be negative

Answer 11

yes cos is negative there

Answer 12

but yours is end up at sin

Answer 13

what do you mean?

Answer 14

you calculate for sin 150 , it cannot be - sqr .....

Answer 15

i honestly don't see what i am missing

Answer 16

you don't have to do anything, why you calculate cos 75?

Answer 17

if it is sin, then 1/2