Math, asked by Bsndndkdkdjjdjr4635, 1 year ago

Cos36.cos54-sin36.sin 54=0

Answers

Answered by jayav2006

7

Answer:

Step-by-step explanation:

Attachments:

Answered by SuwanAryal

4

Answer:

we know cosAcosB-sinAsinB=cos(A+B)

Step-by-step explanation:

Now

cos36.cos54-sin36.sin54=cos(36+54)

So,

Cos(36+54)=Cos90=0

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