Answered

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

Sagot :

msm555

Answer:

we have

Cos (a+b)=Cos aCosb-SinaSinb

for

Cos (a+a)=Cos aCosa-SinaSina=Cos²a-Sin²a

is a required answer.
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