The value of 10-40-50- is equal to

10°(40° 50°) =(50° 40°)(40° 50°) =(50°40°+140° 50°)·(40° 50°) =50°·tan(90° 40°)+1=2 ...

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Trigonometric Ratios of Compound Angles

The value of ...

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The value of $cot 10 ° (cot 40 ° - cot 50 °)$ is equal to

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(1 - cot 5^{\circ}) (1 - cot 10^{\circ}) (1 - cot 15^{\circ}) \dots (1 - cot 40^{\circ}) = 2^{k}

k

{sec}^{- 1} (sec 3) + {cos}^{- 1} (cos 12) + {cosec}^{- 1} (cosec 6) + {cot}^{- 1} (cot 10)

c o t 5^{\circ} c o t 10^{\circ} . . . . . . . . . . . c o t 85^{\circ}

tan 20^{\circ} tan 80^{\circ} cot 50^{\circ}

\frac{tan 53^{\circ}}{cot 37^{\circ}} - \frac{cot 40^{\circ}}{tan 50^{\circ}} + 2

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