chapter 8 .introduction to trigonometry
class 10th
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Step-by-step explanation:
Cos48° Cos42° - Sin48°Sin42°
We know that ,
CosA CosB - sinA SinB = Cos(A + B)
Therefore,
Cos48° Cos42° - Sin48° Sin42°
= Cos(48° + 42°)
= Cos90°
= 0
ANSWER = 0
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