solve this...step by step...
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Answer:
2cos^2@+3sin@=0
2(1-sin^2@)+3sin@=0
2-sin^2@+sin@=0
sin^2@-sin@-2=0
sin^2@-2sin@+sin@-2=0
sin@(sin@-2)+1(sin@-2)=0
(sin@-2)(sin@+1)=0
sin@=2 or sin@=-1
but sin@≠2
sin@=-1
hope it helps you!!
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