- #1
ExamFever
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Homework Statement
P1
sin 2x + sqrt(2) sin (x - (pi/4)) = 1
P2
Two sides of a triangle are 5cm and 9cm long. The ratio of the opposite angles is 1:3. Determine the angles and the length of the third side of the triangle!
Homework Equations
sin(2&) = 2 sin&cos&
sin(& - §) = sin& cos§ - cos& sin §
The Attempt at a Solution
P1
With this problem I'm stuck at:
sin 2x + sqrt(2) sin (x - (pi/4)) = 1
sin 2x + sqrt(2) (sinx (1/2)sqrt(2) - cosx (1/2)sqrt(2)) = 1
sin 2x + sin x - cos x = 1
2 sinx cosx + sin x - cos x = 1
Here I have the equation in one angle, but not in one function. I guess I need to do some changing etc. But I really can't figure out where to start.
P2
Two sides are given and a ratio of opposite angles. I do not even know where to start on this one...help is greatly appreciated!