Question

if sin A = 1/ root 5,sin B=1/root 10,find the values of cos A and cosB​

Answer 1

Answer:

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Answer 2

Answer:

If sinA=1√5 and sinB=1√10 ,find the values of cosA and cosB . Hence using the formula cos(A+B)=cosAcosB-sinAsinB, show that (A+B)=45∘.