2cos(A/2)=+-sqrt(1-sinA)+-sqrt(1+sinA ,)...

`2cos(A/2)=+-sqrt(1-sinA)+-sqrt(1+sinA ,),"w h e n"A/2=278^0`

2cos(A/2)=+-sqrt(1-sinA)+-sqrt(1+sinA ,),"w h e n"A/2=278^0
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2cos((A)/(2))=+-sqrt(1-sin A)+-sqrt(1+sin A,), wh e n(A)/(2)=278^(@)
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If f(A) sqrt((1+sinA/2)+sqrt(1 sinA/2))/sqrt((1+sinA/2)sqrt(1-sinA/2))...
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If sinA=1/2,cosB=(sqrt(3))/2,\ w h e r e\ pi/2<A<pi\ a n d\ 0<B<pi/2 ,...
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If 2 sin""A/2=sqrt(1+sinA)+sqrt(1-sinA,)then A/2 lies between,
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If 2cos""(A)/(2)=sqrt(1+sinA)+sqrt(1-sinA), thenA/2 iles between,
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sqrt((1-sinA)/(1+sinA))=secA-tanA
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sqrt((1-sinA)/(1+sinA))=secA-tanA
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sqrt((1+sinA)/(1-sinA))=(1+sinA)/(cosA).
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