1.
sinA= 0.4
sin^2A+cos^2A=1
cos^2A=1-sin^2A
cos^2a=1-0.4^2=1-0.16=0.84
cosA=√0.84=0.916=11/12
tgA=sinA/cosA
tgA=5/11÷11/12=5/11×12/11=60/121
1.
sinA= 0.4
sin^2A+cos^2A=1
cos^2A=1-sin^2A
cos^2a=1-0.4^2=1-0.16=0.84
cosA=√0.84=0.916=11/12
tgA=sinA/cosA
tgA=5/11÷11/12=5/11×12/11=60/121