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AS Math queries

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master786:
sin(2@ + 60)=0.3584

sin-1(0.3584)=21.000 degrees

21 is the correspondance angle

nd now using the grid .... u will see tht 180-21 & 360+21fit .

180-21= 159
360+21 = 381

ur criteria was 2@+60
therefore 2@+60=159 & 2@+60 = 381

solve these to eqns nd u will end up with the answers

astarmathsandphysics:

--- Quote from: spiderman on September 03, 2009, 11:59:54 am ---Hey guys wud b glad if u cud help me with these sums

find the least 2 +ve values of @...

1)sin(2@+60)=0.3584
2)sin(30-@)=0.5
3)cos(3@-120)=0



--- End quote ---
1)
2=sin-10.3584

2=180-sin-10.3584

2=360+sin-10.3584

2=540-sin-10.3584
and solve these 4 equations

2)sin(30-@)=0.5

sin-1(0.5)

sin-1(0.5)

sin-1(0.5)

spiderman:
Thank you
Master786 and astar

master786:
glad we cud help :)

spiderman:
Find all the values of @ in the interval -180<=@<=180
1)4sin@=5cos@
2)2sin@=1/sin@


Pls help me wit these sums
Guys i really suck in trignometry...wud b glad if u cud post some sites which demonstrate how to solve the type of sums that cum in the as and a level papers..... :)

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