Question

If ABC is right angled at A then what is the value of cos2B+cos2

Answer 1

Answer:

Hello mate..

Step-by-step explanation:

Since ABC is right angled and angle C is 90°

therefore,

A+B=180°-C

A+B=180°-90°

A+B= 90°

Therefore,cos (A+B)=cos90°

=0

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