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If A=30degree and B=60degree then verify that cos(A + B)=cosA cosB -sinA sinB?
Most Upvoted Answer
If A=30degree and B=60degree then verify that cos(A + B)=cosA cosB -si...
Community Answer
If A=30degree and B=60degree then verify that cos(A + B)=cosA cosB -si...
LHS...
= cos(30°+60°)
= cos 90°
= 0


RHS..
= cos 30° cos60° - sin30° sin60°
= √3/2 *1/2 - 1/2*√3/2
= √3/4 - √3/4
= √3-√3 /4
= 0/4..
= 0 ..

LHS=RHS...
hence proved....
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If A=30degree and B=60degree then verify that cos(A + B)=cosA cosB -sinA sinB?
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