Can you help evaluate this equation? $sin^2 (-420°)+ cot (270°) +csc(225°)$

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Answer 1 · 2017-01-17T03:49:53

$+-oo$

Use

$sin (-a) = -sina, sin (360^o+a)=sina, cot(180^o+a)=tan a and csc(180+a)=-csca$ .

Now, the given expression is

$sin^2 60^o +tan 90^o-csc45^o$

$=3/4+-oo+sqrt2$

$=+-oo$ .

Note that $tan 90^o=tan( (90^o) _(+-))=+-oo$ .

Can you help evaluate this equation? sin^2 (-420°)+ cot (270°) +csc(225°)sin^2 (-420°)+ cot (270°) +csc(225°)