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Evaluate sum(sin (A+B)sin(A-B))/(cos^(2)...

Evaluate `sum(sin (A+B)sin(A-B))/(cos^(2)A cos^(2)B)`: if non of `cos A , cos B, cos C` is zero.

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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-TRIGONOMETRIC RATIOS UPTO TRANSFORMATIONS-EXERCISE - 6(C)
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  11. Find the value of cos^(2)112 1/2-sin^(2)52 1/2.

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  18. If cos alpha = (-3)/5 and sin beta = 7/25 where (pi)/2 lt alpha lt pi ...

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  19. If 0 lt A lt B lt (pi)/(4) and sin (A+B)=(24)/(25) and cos (A-B)= (4)/...

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