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c2 DOUBT

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halosh92:
another questions:

solve the following equations for thita ,in the interval 0<thita<360
(sin thita - 1)(5 cos thita + 3)


solve the following equations for x:

cos x= -0.809, -180<x<180

the x value here is= 144, how do we find the rest of the solutions using the diagram method???

astarmathsandphysics:
is the 1st an equation
for the second equation do 360 -theta

http://www.astarmathsandphysics.com/a_level_maths_notes/C3/a_level_maths_notes_c3_finding_multiple_solutions_of_trigonometric_equations.html

halosh92:

--- Quote from: astarmathsandphysics on April 30, 2010, 01:30:38 pm ---is the 1st an equation
for the second equation do 360 -theta

http://www.astarmathsandphysics.com/a_level_maths_notes/C3/a_level_maths_notes_c3_finding_multiple_solutions_of_trigonometric_equations.html


--- End quote ---

yep the first is an equation which is equal to 0

astarmathsandphysics:
Phen put each bracket=0 and solve like in the link

halosh92:
ok thx  ;D ;D ;D ;D ;D
could u please tell me how to solve such questions ?:
 find the values of thita, in the interval 0<thita<360 :
tan(45- thita)=-1

this is my method
let 45-thita = Z
but then how do i find the range for "Z" ???
thx aloooottt

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