Jawaban:
cos² p - sin² p = cos 2p
jdi, cos² 15' - sin² 15' = cos 2(15)
= cos 30'
= 1/2 akar 3
Jawaban Dengan Langkah-langkah:
Cos² 15° – Sin² 15°
= Cos 2(15)
= Cos 2 × 15
= Cos 30
= ½√3
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Jawaban:
cos² p - sin² p = cos 2p
jdi, cos² 15' - sin² 15' = cos 2(15)
= cos 30'
= 1/2 akar 3
Jawaban Dengan Langkah-langkah:
Cos² 15° – Sin² 15°
= Cos 2(15)
= Cos 2 × 15
= Cos 30
= ½√3