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[" (a) "fquad (a)leqslant4],[" 1f "5sin ...

[" (a) "fquad (a)leqslant4],[" 1f "5sin a=3sin(a+2B times0," then "tan(alpha+beta)" is equal to "],[[" (i) "2sin beta," (b) "3tan beta," (c) "4tan beta," (d) "6tan beta]]

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