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7sechx - tanhx = 5 7/coshx - sinhx/coshx = 5 7 - sinhx = 5 cosh x 7 - 0.5(ex - e-x) = 2.5(ex + e-x) 7 -0.5ex + 0.5e-x = 2.5ex +...
Whenever you see a problem involving an inequality (greater than or less than sign) it is really important to pause for a second before you go breaking any rules of mathematics. ...
The initial quadratic can be either positive or negative so we must solve for both possibilities.
Solving for positive:
3x^2 - 19x + 20 < 2x + 2 = 3x^2 - 21x + 18 < 0
a) Need to multiply with conjugate to bring z to form a+ib. => z= z * (1-i)/(1-i) = (4-4i) / 2 = 2-2i
b) z^2 = (2-2i)^2 = 4-8i+4 i^2 = 4-8i-4 = 8i
since z is root of x^2+px+q=0 then z* (c...
De Moivre's theorem: (cos5x + isin5x) = (cosx + isinx)5 To get cos5x we will need to expand (cosx + isinx)5 and then take the real parts. Binomial expansion: (cosx + isinx)5Answered by Chris S. • Further Mathematics tutor30275 Views
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