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If `( cos ( theta_1- theta_ 2 ))/(cos ( theta_1+ theta_2))+( cos ( theta_3 + theta_4))/( cos ( theta_3- theta_4))=0` , then ` tan theta_1 , tan theta_2 tan thet_3 tan theta_4=`

A

1

B

2

C

`-1`

D

none

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 D ( TRANSFORMATIONS )
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