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#1 2007-01-10 07:32:17

Kiran
Member
Registered: 2006-11-15
Posts: 177

evaluating

csc^2  405degrees - tan45degrees


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#2 2007-01-10 08:35:54

mathsyperson
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Registered: 2005-06-22
Posts: 4,900

Re: evaluating

cosec² 405 - tan 45 = (1/sin 405)² - 1

sin 405 = sin 45 = 1/√ 2

Therefore, (1/sin 405) = √2 and so (1/sin 405)² = 2.

This means that the final value is 1.


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