Question

Evaluate the expression given that cosa=4/5 with 0 11 years ago

Answer 1

@Nnesha

Answer 2

see cos A = 4/5
and A is in 1st quad so sin will be positive too
so sin A = 3/5

Answer 3

u get it???o_O

Answer 4

starting to, yes.

Answer 5

you would need sin A as the sum formula requires that right?

Answer 6

yup....and also u need cos B

Answer 7

u got cos B ??? @dtan5457

Answer 8

cos B is positive. it should be...give me a minute

Answer 9

yup its positive...:))

Answer 10

wait -15/17 would look like what as a triangle ?

Answer 11

getting confused on the labels

Answer 12

oh wait

Answer 13

don't consider negative sign .....okay......

Answer 14

kust keep in mind tht in 4th quad sin is negative nd cos is positive

Answer 15

so what would be cos B???

Answer 16

8/17

Answer 17

yup u r right?????now just calculate cos (A + B)

Answer 18

it was supposed to be this ":))))))" instead of "????"

Answer 19

lol alright give me one minute

Answer 20

77/85?

Answer 21

yup....:))

Answer 22

nice thank you. thought this was a lot harder :P

Answer 23

yw...:))