3 years ago

Use angle addition formula to find the expression for cos(a+b). Use the same formula to

Mathematics

2 answers:

melisa1 [442]3 years ago

7 0

What they said!!!!!!!!!!!!

Sav [38]3 years ago

5 0

Answer:

we have

Cos (a+b)=Cos aCosb-SinaSinb

for

Cos (a+a)=Cos aCosa-SinaSina=<u>Cos²a-Sin²a</u>

is a required answer.

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