Math, asked by kusumah883, 5 hours ago

if A+ b =45° then (cos A.cosB- sinA.sinB) is​

Answers

Answered by riyusinha00
0

Answer:

1/✓2

Step-by-step explanation:

we know that

cos(A+B)= cosAcosB-sinAsinB

so,

(cos A. cosB- sinA. SinB)

= cos(A+B).

=cos(45°). {given, A+B=45°}

=1/✓2. {since, cos45°=1/✓2}

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