sin(90-theta)=0.574
how do I solve this? Will give medal to best help.

Question

sin(90-theta)=0.574  
how do I solve this? Will give medal to best help.

amistre64 · Answer

most likely with an identity.

what is sine, written as cosine, look like?  they are complements after all

amistre64 · Answer

|dw:1410024473104:dw|

amistre64 · Answer

90-a = -(a-90)  which matches your problem better

anonymous · Answer

so, I dont know theta and am trying to solve for it, how do I do that?

amistre64 · Answer

well

-sin(90-theta) = -0.574

sin(theta-90) = -0.574

cos(theta) = -0.574

theta = cos^-1 (-0.574 )

amistre64 · Answer

this is one approach

amistre64 · Answer

ive most likely read the problem a little off in my head

amistre64 · Answer

sin(90-theta)=0.574  

we already have a 90-theta, i was reading it backwards ..

so,  sin(90-theta) = cos(theta)

anonymous · Answer

I have to find theta so that resultant force of Fa and Fb is directed horizontally to the right. I have to find magnitude of Fr

anonymous · Answer

$$\sin \left( 90-\theta \right)=\cos \theta=0.574, \theta =\cos^{-1} \left( 0.574 \right)=?$$

anonymous · Answer

I've solved everything out to this point

amistre64 · Answer

|dw:1410024818246:dw|

sin(90-a) = y/r

cos(a) = y/r