Ali greh ^ 2theta-cos ^ 2theta = 1-2sin ^ 2theta?

Ali greh ^ 2theta-cos ^ 2theta = 1-2sin ^ 2theta?
Anonim

Odgovor:

# "Ne" #

# "Skoraj:" #

# sin ^ 2 (theta) - cos ^ 2 (theta) = 2 sin ^ 2 (theta) - 1 #

Pojasnilo:

# sin ^ 2 (theta) + cos ^ 2 (theta) = 1 #

# => sin ^ 2 (theta) - cos ^ 2 (theta) #

# = sin ^ 2 (theta) - (1 - sin ^ 2 (theta)) #

# = 2 sin ^ 2 (theta) - 1 #

Odgovor:

Ne, to bi bilo enako # 2sin ^ 2theta-1 #

Pojasnilo:

Od # cos ^ 2theta = 1-sin ^ 2theta #

Prenos vrednosti # cos ^ 2theta # v originalni enačbi dobimo

# 2sin ^ 2theta-1 #