5sin^2a+0.61+5cos^2a при sin a=-0.4

Question

5sin^2a+0.61+5cos^2a
при sin a=-0.4

Answer 1

sin a=-0.4
sin^2a=0.16
sin^2a+cos^2a =1
cos^2a=1-sin^2a
cos^2a=1-0.16
cos^2a=0.84
5*0.16+0.61+5*0.84=0.8+0.61+4.2=5.61