30°的正弦,余弦,正切值依次是1/2,根号3/2,根号3/3
45°的正弦,余弦,正切值依次是根号2/2,根号2/2,1
30°的正弦,余弦,正切值依次是根号3/2,1/2,根号3
两角和公式
sin(A+B) = sinAcosB+cosAsinB
sin(A-B) = sinAcosB-cosAsinB
cos(A+B) = cosAcosB-sinAsinB
cos(A-B) = cosAcosB+sinAsinB
积化和差
sinasinb = - [cos(a+b)-cos(a-b)]
cosacosb = [cos(a+b)+cos(a-b)]
sinacosb = [sin(a+b)+sin(a-b)]
cosasinb = [sin(a+b)-sin(a-b)]
还需要什么跟我说 30°的正弦,余弦,正切值依次是1/2,根号3/2,根号3/3
45°的正弦,余弦,正切值依次是根号2/2,根号2/2,1
30°的正弦,余弦,正切值依次是根号3/2,1/2,根号3
两角和公式
sin(A+B) = sinAcosB+cosAsinB
sin(A-B) = sinAcosB-cosAsinB
cos(A+B) = cosAcosB-sinAsinB
cos(A-B) = cosAcosB+sinAsinB
积化和差
sinasinb = - [cos(a+b)-cos(a-b)]
cosacosb = [cos(a+b)+cos(a-b)]
sinacosb = [sin(a+b)+sin(a-b)]
cosasinb = [sin(a+b)-sin(a-b)]
还需要什么跟我说