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In any A B C , prove that: 2(b ccosA+c ...

In any ` A B C ,` prove that: `2(b ccosA+c acosB+a bcosC)=a^2+b^2+c^2`

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2(bc cosA+c acosB+a bcosC)=a^2+b^2+c^2

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In any Delta A B C , prove that: (cos A)/a+(cos B)/b+(cos C)/c=(a^2+b^2+c^2)/(2a b c)

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Prove that a(bcosC-ccosB)=b^2-c^2

In any DeltaABC , prove that : (b^2 - c^2)/(cos B + cos C) + (c^2 - a^2)/(cos C + cos A) + (a^2 - b^2)/(cos A + cos B) = 0

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AAKASH INSTITUTE ENGLISH-TRIGNOMETRIC FUNCTIONS -Try Yourself
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  6. Prove that sin20^(@)sin40^(@)sin80^(@)=(sqrt(3))/(8)

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  19. In any A B C , prove that: 2(b ccosA+c acosB+a bcosC)=a^2+b^2+c^2

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  20. In a A B C , if cosC=(sinA)/(2sinB) , prove that the triangle is isos...

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