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