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在△ABC中,cosB=,sin(-C)=.(Ⅰ)求sinA的值;(Ⅱ)若AB=2,求△A...
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在△ABC中,cosB=
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAkCAYAAACAGLraAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAATlJREFU
SEvVVIENhCAMxI3cxy0YgiXYwQGYg8QdWKJPUbHQajWfj3kSo5JyXK/tDZCX6dYwDP2W+F+OIkC/
crS0Le79C0D0qNP6+NikoqeQAtj9EH5nEBtSBVEBUoxwhAOkYMHYUPdUACY9pvMNADJ4lELLIIIn
t5cmhHnaFJ4OYU4aKXoPbQ0ywDzP5aAbDYxuKd9SJyL1roJrbL22MFlZMIAsHM0b8v8O1lRhytSR
BQUoZdubqL6PVBqAxY1gRiemcDZdrA+QxfvTeNsMNjMSRNomj4nX7rdlfHItib3vXScX/AiAOlA3
PMyAGTPqQHl0vGBj9AxLQXMgnUEfgelIY7jFqSJGb8Qx3u+5Bmj0kOt4AZAgWO5AtzWI3gKx/9M+
FRkw+yIOpDJA0a4cSAV4OlNqGTXA9wE+hozxSbXgI+QAAAAASUVORK5CYII=
)
,sin(
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAjCAYAAABGpiBAAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAM1JREFU
OE/FU9ENQyEIpCu7DpswB1O4BAVEq2jr3yvJS9R3gYM7XqIBtzDQLeAG8EqPg1gQwDrcvkLV2QAj
CuuhEoq/VZJSSNrvFoM4Y2kgRoEzqAqVltFB6KeUyUpAL1tOIMuipKNEJQXFmYmCk2cB6Z048ei0
V31+4neJzW5HSfr7f6wSenVuSdzGySY8BA1vZYEr8+KdWbvNT2NaX60yzZMRJFVLK7XwO9hXzf1x
Z1Jq9/hBSgdZRwsPJT/fdaVOAsdS5JX6ZZiH7fsG0udOohBexs8AAAAASUVORK5CYII=
)
-C)=
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKVJREFU
OE/dU9ENhTAIxJVZh02YgylYAqGNlVptNO/FD0mapskB1+NYzANmEYBZwH2AsiGgsfYptYJQ8PBz
Bagoo48DikihQz0ku1gPpL4Yyh8qbMTO7mKm+374jWQzjAuFbNlUYKFiky5M46AkJahIl6GMXZXx
F9EuVziSF5oNq+NTU1MLNUZyb5/tRVmNcSdahWCeTRKLtL0hSI2D2lu9NqyJKVYckNqVrS3EAwAA
AABJRU5ErkJggg==
)
.
(Ⅰ)求sinA的值;
(Ⅱ)若AB=2
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAALtJREFU
OE/Nk9sVhCAMRENH9EMXFEET9EAB1ME59pAmsgmPFRF15Wv5UuQymUlUxAuGpZQat+bvAo+LT862
z+f+HMZIlq2IHfDpW+zU3NFzIm8jYUb4mS9o/DOMWMEimPwbuE80+bdl74oLnjvpGpyNJYFnz8Mg
YLQENUCgYEoLwOwtuJuwzjeEEDLkNJB2WynnEkaKdpZ2rqCoH2BRagPS9fjk2fBHUV/6MTanCbRb
g6UUUV9SbnH/Cn8A/r2EUaEPy7EAAAAASUVORK5CYII=
)
,求△ABC的面积.
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