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If p=sin(989^(@))cos(991^(@)),then which one of the following is correct ? |
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Answer» <P>p is finite and positive Which can be WRITTEN as `=sin(1080^(@)-91)cos(1080^(@)-89^(@))` `=-sin91^(@)cos89^(@)` `=-sin(90^(@)+1^(@))cos89^(@)` `-=cos1^(@)cos89^(@)` As`cos1^(@)andcos89^(@)`are positive. therefore their product is also + ve Hence, p isfinite and negative . |
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