Sin (A + B) = sin A cos B + cos A Sin B
<span>Cos (A - B) = cos A cos B + sin A sin B </span>
<span>=> (SinACosB+ CosASinB) (CosACosB +SinASinB) </span>
<span>=>SinACosACos^2B+Sin^2ACosBSinB+Cos^2A... </span>
<span>=>SinACosA(Cos^2B+Sin^2B) +SinBCosB(Sin^2A+Cos^2A) </span>
<span>we know that Sin^2+Cos^2=1 </span>
<span>=>SinACosA(1)+SinBCosB(1) </span>
<span>=SinACosA+SinBCosB </span>
<span>Proved
</span>
Answer:
45
Step-by-step explanation:
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<h2><em>perimeter = 2(L+b)
</em></h2><h2><em>72 = 2(5x+4+x-4)
</em></h2><h2><em>72/2= 6x
</em></h2><h2><em>36 = 6x
</em></h2><h2><em>x = 36/6
</em></h2><h2><em>x= 6 m
</em></h2><h2><em>
</em></h2><h2><em>Length = 5×6+4
</em></h2><h2><em>= 34 m
</em></h2><h2><em>Breadth = 6-4
</em></h2><h2><em>= 2 m
</em></h2><h2><em> HOPE IT HELPS(◕‿◕✿)</em></h2><h2><em> SMILE!!</em></h2>
