Soalan # 7bd2c

Soalan # 7bd2c
Anonim

Jawapan:

Pilihan (A) diterima di sini.

Penjelasan:

Memandangkan itu, # rarrsintheta + costheta = sqrt (2) cosalpha #

# rarrcostheta * (1 / sqrt (2)) + sintheta * (1 / sqrt (2)) = cosalpha #

# rarrcostheta * cos (pi / 4) + sintheta * sin (pi / 4) = cosalpha #

#rarrcos (theta-pi / 4) = cos (2npi + -alpha) #

# rarrtheta = 2npi + -alpha + pi / 4 #