fetchingsummer44 fetchingsummer44

Today at 6:54 PM
Mathematics

Answered

Express the following as a function of a single angle.
Cos^2(81°) - sin^2(81°)

Answer :

uzamamanzoor1271996 uzamamanzoor1271996

Today at 6:59 PM

Answer:

= [tex]Cos[/tex](162°)

Step-by-step explanation:

[tex]Cos^{2}[/tex](81°) - [tex]Sin^{2}[/tex](81°)

we know that;

[tex]Cos^{2}[/tex](x°) - [tex]Sin^{2}[/tex](x°) = [tex]Cos[/tex](2x°)

[tex]Cos^{2}[/tex](81°) - [tex]Sin^{2}[/tex](81°) = [tex]Cos[/tex](2 * 81°)

= [tex]Cos[/tex](162°)

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