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[" 4"[" If "sin(theta+alpha)=a" and "sin...

[" 4"[" If "sin(theta+alpha)=a" and "sin(theta+beta)=b" ,then "],[cos2(alpha-beta)-4ab cos(alpha-beta)=],[[" 1) "1-a^(2)-b^(2)," 2) "1-2a^(2)-2b^(2)]],[" 3) "2+a^(2)-b^(2)," ."quad 4" ) "2-a^(2)-b^(2)]]

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