is it right say that cos (A+B)=cosA+cosB justify your answer
Answers
Answered by
39
it is wrong,
let A =60 ,B= 30
lhs = cos(A+B)
= cos(60+30)
=cos 90
=0
rhs = cos A+cos B
= cos 60+ cos 30
= 1/2+ root3/2
=(1+ root3)/2
therefore
lhs is not equal to rhs
let A =60 ,B= 30
lhs = cos(A+B)
= cos(60+30)
=cos 90
=0
rhs = cos A+cos B
= cos 60+ cos 30
= 1/2+ root3/2
=(1+ root3)/2
therefore
lhs is not equal to rhs
mysticd:
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Answered by
13
no it is incorrect because
let,a=60 and b=30
then, cos(60+30)=cos60+cos30
which we get an incorrect answer
since,cos(A+B)=cosAcosB-sinAsinB
let,a=60 and b=30
then, cos(60+30)=cos60+cos30
which we get an incorrect answer
since,cos(A+B)=cosAcosB-sinAsinB
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