6. If angle A and angle B are acute angles such that cos A = cos B, then show that
angleA = angleB.
(short trick)
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We are given that,
________
We have to show,
________
Construction,
Draw a triangle ABC where C = 90°.
__________
Solution
We know,
Now , we know that if two sides of triangle are equal than it is isosceles triangle and we also know that in isosceles triangle, if two opposite sides are equal than their angle will also be equal.
Thus, prooved!
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