if a=60 degree and b=30 degree verify that cos(a+b) =cos a cosb - sin a sin b
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Answered by
2
given that:
a=60, b=30.
LHS= cos ( 30+60)= cos90=0
RHS= cos60cos 30 - sin60 sin30
= 1/2×√3/2-√3/2×1/2
= 0
Therefore LHS= RHS.
Answered by
0
Answer:
Step-by-step explanation:
Cos(60+30) =cos 60•cos30-sin60•sin30
Cos90=cos60•sin60-sin60•cos60
0=1-1
0=0
Answer is zero (0)
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