|
and so cos
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Show there also exists ψ such that f
Then letting θ = arcsin
c2 | = 4 +
2 |
= 2ab + b2 + a2 − 2ab = a2 + b2. |
the two equal sides having length a. Show the “base angles” θ and α are equal. Hint: You might want to use the law of cosines and the observation in the above problem.