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If -360^(@) lt A lt -270^(@), show that...

If `-360^(@) lt A lt -270^(@)`, show that `"sin"(A)/(2)=- sqrt((1-cosA)/(2))`

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CHHAYA PUBLICATION-MISCELLANEOUS EXAMPLES-TRIGONOMETRY
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  3. If -360^(@) lt A lt -270^(@), show that "sin"(A)/(2)=- sqrt((1-cosA)/...

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