Question

sin((pi)/2)+(theta)=cos(theta)

Answer 1

do you mean this?

\[\sin (\pi/2) + \theta = \cos (\theta)\]

Answer 2

yeah

Answer 3

without brackets i guess

Answer 4

I think you may have copied it wrong because that's kind of impossible to solve...

Answer 5

pi/2 as in radians

Answer 6

I have to establish an identity s

Answer 7

u're equation should be \[\sin (\frac{ \pi }{ 2 }+\theta) = \cos \theta\] otherwise there will be no meaning

Answer 8

typo

Answer 9

yeah

Answer 10

so what is the question?

Answer 11

your last reply

Answer 12

okay do we have to prove or solve for theta

Answer 13

prove

Answer 14

okay to prove this kinds of equation we only develop the complex side until it is equal to the simple one okay

Answer 15

do u knw double angles identity?

Answer 16

yes

Answer 17

okay use it to expand the left side of ur equation and see what u get

Answer 18

2sin(a)+2cos(a)?

Answer 19

thats the double angle formula right?

Answer 20

sin(pi/2+theta)= cos theta

Answer 21

sorry sin(a+b)=sinacosb+cosa+sinb?

Answer 22

is that the one i want?

Answer 23

s_sorry i used a wrong spelling it actually two angle. sin(a+b)=sinacosb+cosasinb use it to expand ur left hand side of ur equation

Answer 24

yes but there is no plus sign between cosa and sinb

Answer 25

so sin((pi/2)+theta)=sin pi/2+cos theta+cos pi/2 sin theta=1*cos theta+0*sin theta= cos theta?

Answer 26

yes but just check ur plus signs again