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#.