Math, asked by MichSuchana91, 8 months ago

Q9) prove that:
((b ² - c ²)/a)•cos A
+ ((c ² - a ²)/b)•cos B
+ ((a ² - b ²)/c)•cos C
= 0
No irrelevant ans! Plz.​

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Answers

Answered by Anonymous
0

Step-by-step explanation:

Given PQRS is a trapezium in which PQ || PS and PQ = 3 RS

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