if sin theta -cos theta=0 then sin(pi/2-theta)+cos(pi/2-theta)=?

Question

anonymous · Answer

cos theta+sin theta=

ikram002p · Answer

sin theta -cos theta=0  
then 
tan theta =1
theta = tan^-1 (1)
so theta = ?

ikram002p · Answer

or you wanna you sum formula ?

anonymous · Answer

i need the value of sin theta+cos theta=?

ikram002p · Answer

well theta = pi/4 :o

ikram002p · Answer

@ganeshie8 any other way to solve it ?

anonymous · Answer

can we do like that sin pi/2-sin theta +cos pi/2-cos theta?

ikram002p · Answer

well
cos theta =sin theta

and we wanna find cos theta +sin theta =2 cos theta =2 sin theta xD
which i have no idea what is this xD

ganeshie8 · Answer

we can simply substitute $\theta  = \pi/4$ right ?

anonymous · Answer

2 sin pi/4=2*1/sqrt(2)=sqrt(2)

anonymous · Answer

is it right? @ikram002p

anonymous · Answer

or sin pi/4+cos pi/4=1/sqrt(2)+1/sqrt(2)=sqrt(2)

ikram002p · Answer

@ganeshie8  this is what im thinking  off :o
but idk if mmm you know mmm identity or hmmm tricky
or mmm hmmm m m m mm

ganeshie8 · Answer

$\sin \theta - \cos \theta = 0$

gives

$\theta =   \frac{\pi}{4} \pm  n\pi$

right ?

ganeshie8 · Answer

cuz period of $\tan x$ is $\pi$

ikram002p · Answer

yeah also dnt forget
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anonymous · Answer

3ed?

ganeshie8 · Answer

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