Math, asked by sudha3dolly, 8 months ago

show that

cos 36 cos 54 - sin 36 sin 54 = 0

Answers

Answered by ItzVash003

11

Answer:

$LHS = cos54° cos36° − sin54° sin36° = cos54° cos36° − sin(90° - 36°) sin(90° - 54°) = cos54° cos36° – cos36°cos54° = 0 = RHS$

Answered by rbprasad358

11

LHS = cos54° cos36° − sin54° sin36°

= cos54° cos36° − sin(90° - 36°) sin(90° - 54°)

= cos54° cos36° – cos36°cos54°

=0

=RHS

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