shahrajprasad123 shahrajprasad123

18-02-2021
Mathematics

contestada

cos4A+sin4A-2cos2Asin2A=(2cos2A-1)2 prove it.

Respuesta :

ramashshrestha92 ramashshrestha92

18-02-2021

cos4A-sin4A=2cos2A-1

proved below.

Step-by-step explanation:

Given:

cos^4A-sin^4A=2cos^2A-1

LHS=cos^4A-sin^4A

=[cos^2A]^2-[sin^2A]^2

=[cos^2A+sin^2A][cos^2A-sin^2A]

=[1][cos^2A-(1-cos^2A)] [ cos^2A+sin^2A=1]

=[cos^2A-1+cos^2A]

=2cos^2A-1

=RHS.

Answer Link

Otras preguntas

Fill in the blank with the spanish word that best completes the following sentence. La ____________ es la mayor riqueza. Salud palabra mejor cara.

If △ABC ~ △DEF, find the length EF.

Question 3 of 10 - A cos 0 = and sin 0< 0. Identify the quadrant of the terminal side of e and find sin e. A. Quadrant: III sin 0 = - - O B. Quadrant: IV sin

which of the following correctly describes the narrator of this excerpt, "Sharks' Teeth"? Third-person limited recalling a past event. Second person telling a p

I couldn't agree with you more, spending more time with each other would be nice.

Complete the steps to find the product of 52 x 52 x 16 ones x ones o ones x 5 x5 tens ten X ones ten X tens

Anyone Can you please check the already done one, and the rest I just need help!!! please:

Which two details are most important to include in a summary of the excerpt? excerpt from Robinson Crusoe by Daniel Defoe When I waked it was broad day, the wea

Glucose enters the cell through

Who supported the Greensboro Four