Given that is acute and that , prove that: I start by saying that and but then I get stuck.
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Originally Posted by Quacky Given that is acute and that , prove that: I start by saying that and but then I get stuck. Employ the addition formulas.
Do you mean as in Sin(A+B)=SinACosB+CosASinB? I've tried but I can't work out how to get an answer in only
Originally Posted by Quacky Given that is acute and that , prove that: I start by saying that and but then I get stuck. Hi Quacky, Since is acute, draw a right-angled triangle. Hence, the hypotenuse is Hence, Then...
Ah. I would never have got that. Thanks again.
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