3. If tan a =[ 1 + (1 -a )^1/2 ]/[1+(1-a)^1/2] then what is the value of Sin 4a ??
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3. If tan a =[ 1 + (1 -a )^1/2 ]/[1+(1-a)^1/2] then what is the value of Sin 4a ??
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Answer:
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