sonasultananasirah
A. sin 135° - cos 225° + tan 240° sin 135° = sin ( 180 - 45 )° = sin 45° = cos 225° = cos ( 270 - 45 )° = - cos 45° = - tan 240° = tan ( 180 + 60 )° = tan 60° =
sin 135° - cos 225° + tan 240° = - (- ) + = =
b. 3 tan π + 4 cos π - sin π π = 180°
π = .180 = 150° 3 tan π = 3 tan 150° = 3 tan (180 - 30)° = 3 (-tan 30°) = 3 (- ) = π = .180 = 330° 4 cos π = 4 cos 330° = 4 cos (360 - 30)° = 4 (cos 30°) = 4 () =
π = . 180 = 120° sin π = sin 120° = sin (180 - 60)° = sin 60° =
3 tan π + 4 cos π - sin π = + - = =
c. sin 90° = 1 cos 240° = cos (180 + 60)° = - cos 60° = sin 330° = sin (360 - 330)° = - sin 30° = sin 180° = 0 cos 150° = cos (180 - 30)° = - cos 30° = - cos 300° = cos (360 - 60)° = cos 60° =
=sin 45-cos 45+tan 30
=1/2+1/2+tan1/3
=+1/3
b, dan c trlalu pnjang nulis hasilnya.:)
sin 135° = sin ( 180 - 45 )°
= sin 45°
=
cos 225° = cos ( 270 - 45 )°
= - cos 45°
= -
tan 240° = tan ( 180 + 60 )°
= tan 60°
=
sin 135° - cos 225° + tan 240° = - (- ) +
=
=
b. 3 tan π + 4 cos π - sin π
π = 180°
π = .180 = 150°
3 tan π = 3 tan 150°
= 3 tan (180 - 30)°
= 3 (-tan 30°)
= 3 (- )
=
π = .180 = 330°
4 cos π = 4 cos 330°
= 4 cos (360 - 30)°
= 4 (cos 30°)
= 4 ()
=
π = . 180 = 120°
sin π = sin 120°
= sin (180 - 60)°
= sin 60°
=
3 tan π + 4 cos π - sin π = + -
=
=
c.
sin 90° = 1
cos 240° = cos (180 + 60)°
= - cos 60°
=
sin 330° = sin (360 - 330)°
= - sin 30°
=
sin 180° = 0
cos 150° = cos (180 - 30)°
= - cos 30°
= -
cos 300° = cos (360 - 60)°
= cos 60°
=
=
=
= - 2
semoga membantu :) jadikan yang terbaik ya :)