Question

For all Fetha, prove that cos fetha =1/sec fetha

Answer 1

umm

Answer 2

Now, cos theta=b/h........i
sec theta=h/b.......ii

Answer 3

So,
b/h=1/sec theta
cos theta = 1/ sec theta

Answer 4

got it?

Answer 5

@fari321 ???

Answer 6

ummm
you have to solve it using the reciprocal identities or quotient identities

Answer 7

I think I used reciprocal identities

Answer 8

lol

Answer 9

So I was wrong

Answer 10

But I think cos theta =1/sec theta
Cant be proved by other ways.

Answer 11

Let me call the expert @satellite73 can u PLZ help

Answer 12

look at the image i posted

Answer 13

I think I did the same

Answer 14

not sure what you need
by definition \(\sec(\theta)=\frac{1}{\cos(\theta)}\) so \(\cos(\theta)=\frac{1}{\sec(\theta)}\)

Answer 15

@fari321 I did the same.....

Answer 16

yeah that is just about all you can do

Answer 17

hmmmm