[" 5.If "cos(alpha+beta)=0," then "sin(a...

[" 5.If "cos(alpha+beta)=0," then "sin(alpha-beta)" can be reduced to "],[[" (A) "cos beta," (B) "cos2 beta," (C) "sin alpha," (D) "sin2 alpha],[" 6."" The value of "(tan1^(@)tan2^(@)tan3^(@),...tan89^(@))" is "]]

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