Math, asked by bhavyagarg2639, 7 months ago

Cos25°.cos65°-sin65°.cos65°

Answers

Answered by majesty10

0

Answer:

THE ATTACHMENT WILL HELP YOU

Attachments:

Answered by asazmi21

0

Answer:

Note:

CosA *CosB -SinA *SinB , and, CosA =Sin(90-A), so Cos(65)=Sin(90-65) =Sin25,

Therefore,

Cos25 *Cos65 -Sin65 *Cos65=Cos25 *Cos65 -Sin65 *Sin(90-65)

=Cos25*Cos65 -Sin25 *Sin65= Cos(25+65)=Cos90=0,

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