[[" (a) "45^(@)," (b) "60^(@)," (c) "90^...

[[" (a) "45^(@)," (b) "60^(@)," (c) "90^(@)]],[[" 12.If "cos(alpha+beta)=0" then "sin(alpha-beta)=?,],[[" (a) "sin alpha," (b) "cos beta," (c) "sin2 alpha]]],[" 1) "+(15^(@)+9)-cos(45^(@)-0)=2]

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