Q. 175.0( 1 Vote )

# Evaluate the foll

Answer : Formula used: where,  Let, Here, f(x) = cos x Now, by putting x = a in f(x) we get,

f(a) = cos a

f(a + h)

= cos (a + h)

Similarly, f(a + 2h)

= cos (a + 2h) We know, Therefore,  { nh = b – a}           { 2 cos A sin B = sin(A + B) – sin(A – B)}     Rate this question :

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