Question

Evaluate cosec39° × cos51°+ tan21× cot 69- sec square 21

Answer 1

identities used,

1)cosec 39°=
$\frac{1}{ \sin \: 39}$
2)sin(90° - 51°)= cos 51°
3)cot(90° - 21°)= tan 21°
4)
$\sec ^ {2}21 = 1 + \tan ^{2} 21$


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Answer 2

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