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in Trigonometry by (49.1k points)
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Without using trigonometric tables, find the value of:

\(\frac 23 \left(\frac{\sec 56°}{cosec \,34°}\right) - 2\cos^220°+ \frac 12 \cot 28° \cot 35° \cot45° \cot 62° \cot 55° - 2\cos70°\)

(a) \(\frac 45\)

(b) \(- \frac 34\)

(c) \(- \frac 56\)

(d) 1

1 Answer

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by (48.0k points)
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Best answer

Correct option is (c) \(- \frac 56\)

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