Tentukan nilai dari sin 150°+300° =
Jawaban:
150 = ( 150° – 90° ) = 60 ( K.II )
sin 60 = 1/2
300 = ( 300 – 270 ) = 30 ( k.IV)
cos 30 = 1/2
1/2 + 1/2 = 2/2 → 1
ATAU
Sin 150 + cos 300
=1/2 +1/2
=1
*maaf kalau salah*
Jawaban:
sin 150⁰+ sin 300⁰
=sin (180⁰-150⁰)+ (-sin (360⁰-300⁰)
=sin 30⁰+(-sin 60⁰)
=1/2+(-1/2akar 3)