1.

cos 38° cos 52° —sin 38° आए 529&

Answer»

We know,cosA cosB - sinA sinB = cos(A+B)

Here we have A = 38° and B = 52°

cos(38°)cos(52°) - sin(38°)sin(52°)= cos(38°+52°)= cos(90°)= 0



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