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Popular >

2sin(x)cos(x)-sin(x)+2cos(x)-1=0

Solution

2 sin (x) cos (x) - sin (x) + 2 cos (x) - 1 = 0

Solution

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn, x = \frac{3 π}{2} + 2 πn

Degrees

x = 6 0^{\circ} + 36 0^{\circ} n, x = 30 0^{\circ} + 36 0^{\circ} n, x = 27 0^{\circ} + 36 0^{\circ} n

Solution steps

2 sin (x) cos (x) - sin (x) + 2 cos (x) - 1 = 0

Factor

2 sin (x) cos (x) - sin (x) + 2 cos (x) - 1 : (2 cos (x) - 1) (sin (x) + 1)

2 sin (x) cos (x) - sin (x) + 2 cos (x) - 1

= (2 sin (x) cos (x) - sin (x)) + (2 cos (x) - 1)

Factor out

sin (x)

from

2 sin (x) cos (x) - sin (x) : sin (x) (2 cos (x) - 1)

2 sin (x) cos (x) - sin (x)

Factor out common term

sin (x)

= sin (x) (2 cos (x) - 1)

= (2 cos (x) - 1) + sin (x) (2 cos (x) - 1)

Factor out common term

2 cos (x) - 1

= (2 cos (x) - 1) (sin (x) + 1)

(2 cos (x) - 1) (sin (x) + 1) = 0

Solving each part separately

2 cos (x) - 1 = 0 or sin (x) + 1 = 0

2 cos (x) - 1 = 0 : x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

2 cos (x) - 1 = 0

Move

1

to the right side

2 cos (x) - 1 = 0

Add

1

to both sides

2 cos (x) - 1 + 1 = 0 + 1

Simplify

2 cos (x) = 1

2 cos (x) = 1

Divide both sides by

2

2 cos (x) = 1

Divide both sides by

2

\frac{2 cos ( x )}{2} = \frac{1}{2}

Simplify

cos (x) = \frac{1}{2}

cos (x) = \frac{1}{2}

General solutions for

cos (x) = \frac{1}{2}

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

sin (x) + 1 = 0 : x = \frac{3 π}{2} + 2 πn

sin (x) + 1 = 0

Move

1

to the right side

sin (x) + 1 = 0

Subtract

1

from both sides

sin (x) + 1 - 1 = 0 - 1

Simplify

sin (x) = - 1

sin (x) = - 1

General solutions for

sin (x) = - 1

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = \frac{3 π}{2} + 2 πn

x = \frac{3 π}{2} + 2 πn

Combine all the solutions

x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn, x = \frac{3 π}{2} + 2 πn

Popular Examples

sec^2(x)=2tan(x)

sec^{2} (x) = 2 tan (x)

4sin^2(x)-8cos(x)+1=0

4 sin^{2} (x) - 8 cos (x) + 1 = 0

sec^2(θ)=4

sec^{2} (θ) = 4

sin(a)= 5/13

sin (a) = \frac{5}{13}

sin(θ)=(-1)/2

sin (θ) = \frac{- 1}{2}