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Standard Formulae - 1

43. tan[÷ 4-c...

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43. tan[÷ 4-cos inverse 4÷ 5]

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(\frac{1}{4} + \frac{1}{4^{2}} + \frac{1}{4^{3}} - - - - + \frac{1}{4^{n - 1}})

Q. What is the present age of Tanya?
I. The ratio between the present ages of Tanya and her brother Rahul is 3 : 4 respectively.
II. After 5 years the ratio between the ages of Tanya and Rahul will be 4 : 5.
III. Rahul is 5 years older than Tanya.

{(\frac{\sin 47 °}{\cos 43 °})}^{2} + {(\frac{\cos 43 °}{\sin 47 °})}^{2} - 4 \cos^{2} 45 °

Q. sin 47°cos 43° + cos 47°sin 43° = ?
(a) sin 4°
(b) cos 4°
(c) 1
(d) 0

Q. Write the additive inverse of

\frac{43}{9}

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