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Simplifying cos(2x) + cos(4x) = cos(x) Remove parenthesis around (2x) cos * 2x + cos(4x) = cos(x) Reorder the terms for easier multiplication: 2cos * x + cos(4x) = cos(x) Multiply cos * x 2cosx + cos(4x) = cos(x) Remove parenthesis around (4x) 2cosx + cos * 4x = cos(x) Reorder the terms for easier multiplication: 2cosx + 4cos * x = cos(x) Multiply cos * x 2cosx + 4cosx = cos(x) Combine like terms: 2cosx + 4cosx = 6cosx 6cosx = cos(x) Multiply cos * x 6cosx = cosx Solving 6cosx = cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1cosx' to each side of the equation. 6cosx + -1cosx = cosx + -1cosx Combine like terms: 6cosx + -1cosx = 5cosx 5cosx = cosx + -1cosx Combine like terms: cosx + -1cosx = 0 5cosx = 0 Divide each side by '5'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
| 17/30-11/20 | | D/6-4-5 | | 6(.575+.125)+3Y=4.80 | | 16-9a-9=5a-10 | | -241=4-5(1+8x) | | y=60-2(27-2/5y) | | 0.3(3x+2)=0.6 | | X*.2+a=75 | | f(x)=(x-3)(x-8) | | .05n+.10n(2n-1)=1.40 | | 5x+12x^3= | | 4s+8(3s-5)=1164 | | 0.3(3x-2)=0.6 | | k(z)=z(z-3)(z+1) | | 30x=7+3y | | 190=2(w+15)+2w | | 3b=1/3 | | X-2.5=7.3 | | 12x+1=10x-2 | | r^4=356 | | 14p-20q-6= | | 11-5(y-3)=26 | | 5000=25m+500 | | 2r^2+1=5r | | 8.50+55.00=123 | | A(3-x)=-2x+b | | 16t-6=18 | | -156=-8(3+3m)+2m | | Z^2+10z+2=0 | | G-125=320 | | (-39/4)×(7/9) | | $45hr=$55/$60 |