MATH-3190 Lecture 31: 31 functions from a to b

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pinkmuskrat141

11 Dec 2018

School

Clemson University

Department

Mathematical Sciences

Course

MATH-3190

Professor

Elena Dimitrova

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"r,e,\~1"\ c,n, / r l. \"1cnons (en t l\/30 s-cun~,c\e. "-~) : x, \. \ aro ~, x 1. ~ x , l-\ x ( \ , \ " ) , ( i , \ ) R ,~ \"\~t " f u"(")q\,cn oc:co. u ~ c (\, -\ ~ , l \ , j.

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Let F(x,y,z)=<ze^x+1,cosy,e^x>

[1] 1. (a) Solve 2 – 31 < 7. Solution: We have – 7<-3 < 7 which gives -4 0 on (-0, 1] U [2,). Next, we need to see where Vr2 – 3r +2 -1 > 0. If r2 - 3.c + 2 – 1 > 0, then V.22 – 3.0 +2 > . Observe that this is definitely true if r < 0. If r > 0, then squar- ing both sides we get 22 - 3.+2 > 1 2 > 3. V A VICO Thus, the domain of f is (-00, ). [2] (c) Find the exact value of tan(sec-14). Solution: Let y = sec-14. Then, sec y = 4. From the diagram we get that tan(sec-? 4) = tan y = 15 [2] (d) Find all r such that sin(2.x) = COS I. Solution: We have 2 sin r cos r = COS I, SO 0 = 2 sin Cos I -Cos I = cos .r (2 sin c - 1). Hence, sin(2x) = cost when cos x = 0, or when sin r = Thus, r= +ik, kez, I= +2nk, ke Z, or r= +2nk, kez [2] (e) State the precise mathematical definition of lim f(x) = 0. Solution: For every e > 0 there exists a 8 >0 such that if 0 < x-al <, then f(c) >

MATH-3190 Lecture 31: 31 functions from a to b

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Related textbook solutions

Calculus

Single Variable Calculus: Early Transcendentals

CALCULUS:EARLY TRANSCENDENTALS

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