madsncurtis madsncurtis

23-04-2021
Mathematics

contestada

Which of the following are identities? Check all that apply.

Which of the following are identities Check all that apply class=

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tk6199235 tk6199235

23-04-2021

Answer:

b. cos²3x - sin²3x = cos6x

if its wrong sorry

hope this helps you☺️☺️

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gayanepoghosyan gayanepoghosyan

23-04-2021

Answer:

B and D

Step-by-step explanation:

B.cos²3x-sin²3x=cos6x ( as cos²a -sin² a = cos 2a)

D.(sinx+cosx)²=sin²x+cos²x+2sinxcosx=1+sin2x

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