C1 Edexcel Jan2010 Question! Please help!

[astarmathsandphysics]

120
120*0.95
120*0.95^2
etc

[halosh92]

Do you need the a) part as well? (i mean the curve)

b) sin^-10.35= x-30
    x=20.5^o+30
     =50.5^o

no i dont need part (a) thx
but thats not the answer..i got 50.5 but then wat do we do ?
:S

[nid404]

what's the answer?

[halosh92]

what's the answer?

-170.5
50.5

[nid404]

oh yes
it says all possible values...
sin(180-theta)=sin theta => value of x in this case is great than 180...so rejected
sin(-180-theta)=sin theta

-180-20.5=-200.5
-200.5= x-30
x=170.5

[halosh92]

oh yes
it says all possible values...
sin(180-theta)=sin theta => value of x in this case is great than 180...so rejected
sin(-180-theta)=sin theta

-180-20.5=-200.5
-200.5= x-30
x=170.5

could u please tell me how to do this...?? like are there any rules for the cos , sin and tan curves? any websites or gd resources for
understanding this entire lesson? please!!!!!!!!!!!!

[nid404]

here http://www.s-cool.co.uk/alevel/maths/trigonometry.html

[~ A.F ~]

here http://www.s-cool.co.uk/alevel/maths/trigonometry.html

i love this site..u've got great resources Nid

[nid404]

i love this site..u've got great resources Nid

thank u A.F, thank u

[halosh92]

thx alot

[albiol18]

monday m1 c1 prepared? :S