80 − 59

___ + _ + ___ =

So 80 − 59 =

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Solution

1 + 10 + 10 = $21$

So,
80 − 59 = $21$

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\frac{cos 80^{\circ}}{sin 10^{\circ}} + cos 59^{\circ} c o s e c 31^{\circ}

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Without using tables evaluate 3 cos 80⁰. cosec 10⁰ + 2 sin 59⁰ sec 31⁰

3 cos 80^{o} . cosec 10^{o} + 2 sin 59^{o} . sec 31^{o}

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