4-cot230-1-sin230-2cos245-sin20-

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Standard Values of Trigonometric Ratios

4/cot230∘+1/s...

Question

$\frac{4}{c o t^{2} 30^{\circ}} + \frac{1}{s i n^{2} 30^{\circ}} - 2 c o s^{2} 45^{\circ} - s i n^{2} 0^{\circ}$

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\frac{4}{\cot^{2} 30 °} + \frac{1}{\sin^{2} 30 °} - 2 \cos^{2} 45 ° - \sin^{2} 0 °

cos 90^{\circ} = 1 - 2 {sin}^{2} 45^{\circ} = 2 {cos}^{2} 45^{\circ} - 1

$s i n^{2} 30^{o}$ + 4 $c o t^{2} 45^{o}$ - $s e c^{2} 60^{o}$ = ?

(a) 0 (b) $\frac{1}{2}$ (c) 4 (d) 1

Sin40/sin80 + sin80/sin20 - sin20/sin40

A 1

B 2

C 3

D 4

\sin^{2} 30 ° \cos^{2} 45 ° + 4 \tan^{2} 30 ° + \frac{1}{2} \sin^{2} 90 ° + \frac{1}{8} \cot^{2} 60 °

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