Question

Please help!!!!!!!! verify the identity.

sin (x+pi/2)=cos x

Answer 1

please help!!!

Answer 2

sin (x+pi/2)= sin(x) * cos(pi/2) + cos(x)* sin(pi/2)

Crank this out. @z123t6

Answer 3

I am sorry I dont understand this at all... can you please break it down more

Answer 4

@directrix

Answer 5

Use sin (a+b) = sin a . cos b + cos a .sin b

Answer 6

and thats it?

Answer 7

Use this formula here: sin (pie/2 + x) ....

Answer 8

Use \(\sin(\pi/2-x) = \cos(x)\)?

Answer 9

ahhh i am so confused im sorry i just dont get it

Answer 10

sin (x+pi/2)= sin(x) * cos(pi/2) + cos(x)* sin(pi/2)

sin (x+pi/2)= sin(x) * 1 + cos(x) * 0

sin (x+pi/2)= ? @z123t6

Answer 11

Trig has a lot of memorizing or use it until you remember it work.

In this problem, you have to know the sine of a sum of angles formula.

Then, you have to know the sine and cosine values of various angles.

Then, you have to use algebra to put all that together.

Answer 12

oh okay so would sin (x+pi/2) = cos x?

Answer 13

Based on the work, yes.

Answer 14

and would that be my final answer or is there more to it?

Answer 15

This is a proof or demonstration. You have to show all the work so that the answer makes sense.

Verify the identity:

sin (x+pi/2)=cos x
-----------------
sin (x+pi/2)= sin(x) * cos(pi/2) + cos(x)* sin(pi/2)

sin (x+pi/2)= sin(x) * 1 + cos(x) * 0

sin (x+pi/2) = cos x

Answer 16

ohhh okay well thank makes a lot more sense now lol :) thank you so much!

Answer 17

Glad to help.