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If cos(A-B)=3/5 and tanA tanB=2, then...

If cos(A-B)=3/5 and tanA tanB=2, then a.cos A cosB=1/5 b. cosA cos B= -1/5 c. sin A sin B= -1/5 d. sin A sin B= -1/5

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS OF COMPOUND ANGLES-All Questions
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  6. tan20^@+tan40^@+sqrt3 tan20^@ tan40^@= (a).sqrt3/4 (b).sqrt3/2 (c).s...

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  8. If 3sintheta+4costheta =5 then find the value of: 4sintheta-3costheta

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  9. The value of: tan3A-tan2A-tanA =

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  19. If (tan69^0+t a n 66^0) /(1-tan69^@tan66^@)=2k ,\ t h e n\ k= -1 b. 1...

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