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Let (sin(theta-alpha))/(sin(theta-beta))...

Let `(sin(theta-alpha))/(sin(theta-beta))=(a)/(b)` and `(cos(theta-alpha))/(cos(theta-beta))=(c )/(d)` then `(ac+bd)/(ad+bc)=`

A

`cos(alpha-beta)`

B

`sin(alpha-beta)`

C

`sin(alpha+beta)`

D

`cos(alpha+beta)`

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The correct Answer is:
A
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AAKASH SERIES-COMPOUND ANGLES-LECTURE SHEET (EXERCISE - I)
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  8. Let (sin(theta-alpha))/(sin(theta-beta))=(a)/(b) and (cos(theta-alpha)...

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  9. If (tan(alpha + beta - gamma))/(tan(alpha - beta + gamma)) = (tan gamm...

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  10. If A, B, C are the angles of a triangle such that "cot"(A)/(2)="3 tan"...

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  12. Let 0lt x lt pi//4, then (sec2x-tan2x) equals

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  13. Which of the following number(s) is/are rational ?

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  14. If alpha+beta+gamma =2pi, then

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  16. If tan theta + tan phi =a, and cot theta + cot phi =b, and theta - phi...

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  17. If cos(alpha - beta) + cos(beta - gamma)+ cos(gamma-alpha)=-3/2, then

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  18. If sin alpha=A sin(alpha + beta), A ne 0, then: The value of tan al...

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  19. If sin alpha = A sin (alpha+beta), A ne 0 then The value of tan bet...

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