sin^2 30°+cos()=1
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sin^230°+cos()=1sin^230°+cos()=1sin^230°+cos()=1cosa=1-sin^230°cosa=1-1/4=3/4a=arccos(3/4)解:sin^230°
sin^2 30°+cos()=1
sin^2 30°+cos()=1
sin^2 30°+cos()=1
cosa=1-sin^230°
cosa=1-1/4=3/4
a=arccos(3/4)
解:
sin^2 30°+cos()=1
(1/2)^2+cos()=1
cos()=3/4
所以()=arccos3/4
sin^2 30°+cos()=1
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