Math, asked by ChhayaJaiswal68, 4 months ago

Evaluate (without using )
a) cos 65° cos 25° - sin 65° sin 25°

Answers

Answered by saniya13479

0

Answer:

sorry I didn't know about this

Answered by usernametaken8

0

Step-by-step explanation:

Using identity CosA×CoB - SinA×SinB = Cos(A+B)

Therefore,

cos 65° cos 25° - sin 65° sin 25° = cos(65+25)° = cos 90°=

= 0

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