Evaluate- sin 2 70 o cos 2 20 o - csc 2 20 o sec 2 70 o -2cos 70 o cosec 20 o

= sin ^ 2 70 ^ o #160; / cos ^ 2 20 ^ o #160; + csc ^ 2 20 ^ o #160; / sec ^ 2 70 ^ o #160; 2cos 70 ^ o #160; cosec 20 ^ o #160; = ...

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Sum of Infinite Terms of a GP

Evaluate: si...

Question

Evaluate:
$\frac{{s i n}^{2} 70^{o}}{{c o s}^{2} 20^{o}} + \frac{{c s c}^{2} 20^{o}}{{s e c}^{2} 70^{o}} - 2 c o s 70^{o} c o s e c 20^{o}$

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