Question

if A = 60°,B=30°,verify that: cos(A-B) = cos A cos B + sinA sinB​

Answer 1

Hi !

Solution :-

from LHS cos(A-B) = cos ( 60°-30°) = cos30° =√3/2

from RHS

=cosA * cosB + sinA * sinB

= cos60° * cos30° + sin60° sin30°

= 1/2 * √3/2 + √3/2 * 1/2

= √3/4 + √3/4 = 2√3/4 = √3/2

hence ,here prooved , lHS = tha Prooved ✔

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Hope it helps you !!

@Raj ✔✔✔

Answer 2

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