if a=b=60degree verify that cos ( a - b ) =cos A cos B + sin A sin B
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Step-by-step explanation:
= { - x}^{4 } - 3 {x}^{3} + 5 {x}^{2} - 5
= { - x}^{4 } - 3 {x}^{3} + 5 {x}^{2} - 5x
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Answer:
a=b=60degree
cos (a-b)=cos A
cos B+sin A sin B
60=cos B + sin A sin B
theri for cos (a-b)=cos A cos B + sin B
simplify this question as last coa tan +tan^2 titha .
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