(CosAcosB+sinAsinB)²+(sinAcosB-cosAsinB)²=?
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= sin square (a+b) + cos square (a+b) = 1
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heya here is your answer
first apply formula (a+b)²=a²+b²+2ab
then to onother apply formula (a-b)²=a²+b²-2ab
then simply it
first apply formula (a+b)²=a²+b²+2ab
then to onother apply formula (a-b)²=a²+b²-2ab
then simply it
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