Find the principal values of the followi...

Find the principal values of the following :
`cos^(-1)(-1/sqrt(2))`

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MODERN PUBLICATION-TRIGONOMETRY-Exercise 3(o)Long Answer type Question-I

In any triangle ABC, prove that (i)(a-b)/( c)=("sin"(A-B)/(2))/("cos"(...
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In any triangle A B C , prove that: acos((B+C)/2)=(b+c)sinA/2
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In any triangle A B C , prove that: acosA+bcosB+ccosC=2as inBs inC
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In any triangle ABC, if a="\ "18 , b="\ "24 , c="\ "30 , find cosA, co...
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Find the principal values of the following : cos^(-1)(-1/sqrt(2))
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Prove in any triangle ABC that (i)a(cos B+cos C)=2(b+c) "sin"^(2)(...
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Prove in any triangle ABC that (i)(a "sin"(B-C))/(b^(2)-c^(2))=(ab"...
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Prove in any triangle ABC that (i) a^(2)+b^(2)+c^(2)=2(bc cos A +ca ...
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Prove in any triangle ABC that (i)("tan"C)/("tan"A)=(b^(2)+c^2 -a^2)...
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In any DeltaABC, prove that : (b+c) cos (B+C)/2 = a cos (B-C)/2.
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In any DeltaABC, prove that : 2(a sin^2 C/2 + c sin^2 A/2) = a+c-b
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In triangle ABC, prove thattan(B-C)/2=(b-c)/(b+c)cotA/2tan(C-A)/2=(c-a...
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In any triangle ABC, (a+b)^2 sin^2 ((C )/(2))+(a-b)^2 cos^2 ((C )/(2))...
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In Delta ABC prove that (i)a=bcosC+ccosB (ii) b=ccosA+acosC (iii) c=ac...
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In triangle ABC, if a = 18, b = 24 and c = 30 then find (i) cos A, co...
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