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Draw the graph of f(x) = (sin x)/(sqrt(1...

Draw the graph of `f(x) = (sin x)/(sqrt(1 + tan^(2)x))- (cos x)/(sqrt(1 + cot^(2)x))`. Then find the range of f(x).

Text Solution

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`f(x) = (sin x)/(|sec x|) - (cos x)/(|"cosec "x|)`
`= sin x *| cos x| - cos x * |sin x|`
`= {{:(0",", x in (0", "pi//2)),(-sin 2x, x in (pi//2, pi)),(0",", x in (pi, 3pi//2)),(sin 2x",", x in (3pi//2, 2pi)):}`
Clearly the domain of f(x) is `R - {(npi)/(2), n in Z}` and the period of f(x) is `2pi`.
So the range of f(x) is (-1, 1).
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Knowledge Check

  • f(x)=sqrt(1-sin^(2)x)+sqrt(1+tan^(2)x) then

    A
    fundamental period of `f(x) " is " pi`
    B
    range of `f(x)" is "[2, oo)`
    C
    domain of `f(x)` is R
    D
    `f(x)=2` has 3 solution in `[0, 2pi]`

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