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11th Standard English Medium Business Maths Subject Trigonometry Book Back 1 Mark Questions with Solution Part - I

11th Standard

    Reg.No. :
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Business Maths

Time : 00:30:00 Hrs
Total Marks : 5
    5 x 1 = 5
  1. The value of cos245o - sin245o is_______.

    (a)

    \(\frac{\sqrt3}{2}\)

    (b)

    \(\frac{1}{2}\)

    (c)

    0

    (d)

    \(\frac{1}{\sqrt{2}}\)

  2. The value 4cos340o - 3cos40o is ________.

    (a)

    \(\frac{\sqrt3}{2}\)

    (b)

    \(\frac{-1}{2}\)

    (c)

    \(\frac{1}{2}\)

    (d)

    \(\frac{1}{\sqrt2}\)

  3. If \(\sin A=\frac{1}{2}\) then \(4\cos^3A-3\cos A\) is ________.

    (a)

    1

    (b)

    0

    (c)

    \(\frac{\sqrt3}{2}\)

    (d)

    \(\frac{1}{\sqrt{2}}\)

  4. The value of \(cosec^{-1}\left(\frac{2}{\sqrt{3}}\right)\) is ________.

    (a)

    \(\frac{\pi}{4}\)

    (b)

    \(\frac{\pi}{2}\)

    (c)

    \(\frac{\pi}{3}\)

    (d)

    \(\frac{\pi}{6}\)

  5. If \(\alpha\) and \(\beta\) be between 0 and \(\frac{\pi}{2}\) and if \(\cos(\alpha+\beta)=\frac{12}{13}\) and \(\sin(\alpha-\beta)=\frac{3}{5}\) then \(\sin2\alpha\) is  _____.

    (a)

    \(\frac{16}{15}\)

    (b)

    0

    (c)

    \(\frac{56}{65}\)

    (d)

    \(\frac{64}{65}\)

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