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Determine the sign of the product sin(1) cos(2) tan(3) cot(4) sec(5) * csc(6), where angles are in radians.

Mathematics

ScanSolve AI Answer

Answer

Negative\text{Negative}

Step-by-step solution

3 steps

The problem asks to determine the sign of the product sin⁡(1)⋅cos⁡(2)⋅tan⁡(3)⋅cot⁡(4)⋅sec⁡(5)⋅csc⁡(6)\sin(1) \cdot \cos(2) \cdot \tan(3) \cdot \cot(4) \cdot \sec(5) \cdot \csc(6). The angles are in radians.

  1. Determine the quadrant for each angle.

    We use the fact that π≈3.14159\pi \approx 3.14159 and 2π≈6.283182\pi \approx 6.28318.

    • 1 radian is in Quadrant I (0<1<π/2≈1.570 < 1 < \pi/2 \approx 1.57).
    • 2 radians is in Quadrant II (π/2≈1.57<2<π≈3.14\pi/2 \approx 1.57 < 2 < \pi \approx 3.14).
    • 3 radians is in Quadrant II (π/2≈1.57<3<π≈3.14\pi/2 \approx 1.57 < 3 < \pi \approx 3.14).
    • 4 radians is in Quadrant III (π≈3.14<4<3π/2≈4.71\pi \approx 3.14 < 4 < 3\pi/2 \approx 4.71).
    • 5 radians is in Quadrant IV (3π/2≈4.71<5<2π≈6.283\pi/2 \approx 4.71 < 5 < 2\pi \approx 6.28).
    • 6 radians is in Quadrant IV (3π/2≈4.71<6<2π≈6.283\pi/2 \approx 4.71 < 6 < 2\pi \approx 6.28).
  2. Determine the sign of each trigonometric function in its respective quadrant.

    • sin⁡(1)\sin(1): Quadrant I, sin⁡\sin is positive.
    • cos⁡(2)\cos(2): Quadrant II, cos⁡\cos is negative.
    • tan⁡(3)\tan(3): Quadrant II, tan⁡\tan is negative.
    • cot⁡(4)\cot(4): Quadrant III, cot⁡\cot is positive.
    • sec⁡(5)\sec(5): Quadrant IV, sec⁡\sec is positive (since cos⁡\cos is positive in Q4).
    • csc⁡(6)\csc(6): Quadrant IV, csc⁡\csc is negative (since sin⁡\sin is negative in Q4).
  3. Multiply the signs together.

    The product of the signs is (+)⋅(−)⋅(−)⋅(+)⋅(+)⋅(−)(+) \cdot (-) \cdot (-) \cdot (+) \cdot (+) \cdot (-).

    (+)⋅(−)⋅(−)⋅(+)⋅(+)⋅(−)=(−)⋅(−)⋅(+)⋅(−)=(+)⋅(+)⋅(−)=(+)⋅(−)=(−)(+) \cdot (-) \cdot (-) \cdot (+) \cdot (+) \cdot (-) = (-) \cdot (-) \cdot (+) \cdot (-) = (+) \cdot (+) \cdot (-) = (+) \cdot (-) = (-)

    The overall sign of the product is negative.

    The student's work shows:
    sin⁡1cos⁡2tan⁡3cot⁡4sec⁡5csc⁡6\sin 1 \quad \cos 2 \quad \tan 3 \quad \cot 4 \quad \sec 5 \quad \csc 6
    +−−++−+\quad -\quad -\quad +\quad +\quad -
    =negative= \text{negative}

    This matches our calculation.

    The value of the expression is negative.
    The options given are (1) Positive, (3) Zero. Option (2) is likely Negative, and (4) is likely Undefined or another option. Based on the student's work, the answer is negative.

    The final answer is Negative\text{Negative}.

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