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Cos(A+B)Cos(A-B)

If Δ ABC is...

Question

If $Δ A B C$ is right angled at 'C', then find the values of cos (A + B) and sin (A + B).

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Solution

$C$ is an right angle means $A + B = 90^{o}$
Hence $cos (A + B) = cos 90 = 0$
and $sin (A + B) = sin 90 = 1$

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Cos(A+B)Cos(A-B)

Standard XII Mathematics

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