Question

cos 36 cos 54 - sin 36 sin 54 = 0​

Answer 1

Answer:

Hey!!!

Here is your answer!!!

cos36 cos 54-sin(90-54) sin(90-36) cos 36 cos 54-cos54 cos 36 =0

I hope it will help you!!!

Answer 2

Step-by-step explanation:

to prove cos36° cos54° - sin36° sin54° = 0

Take LHS

= cos36° cos54° - sin36° sin54°

= cos36°.cos(90-36)° - sin36°.sin(90-36)°

= cos36°.sin36° - sin36°.cos36°

= 0

= RHS

=> LHS = RHS

hence proved