Solving trigonometric equations using sum and difference identities

Solving trigonometric equations using sum and difference identities

Lessons

  • 1.
    Utilizing "Sum and Difference Identities" to solve:

    a)
    sin(x+π4)+sin(xπ4)=1,\sin (x + {\pi \over 4} ) + \sin (x - {\pi \over 4} ) = -1,
    general solution in degrees

    b)
    cos3xcosx+sin3xsinx=0,\cos 3x \cos x + \sin 3x \sin x =0,
    0x0 \leq x < 2π2\pi