1.

I : Ifcos A =(3)/(4) " then " cos""(A)/2 cos""(5A)/(2) =-7 II : Ifsin (120^(@) - alpha ) = sin(120^(@) - beta ) and 0 lt alpha , beta lt pi" then " alpha + beta + 60^(@)

Answer»

only I is TRUE
only II is true
both I & II are true
NEITHER I nor II are true

Answer :C


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