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If cos(theta+phi)=mcos(theta-phi) ,then ...

If `cos(theta+phi)=mcos(theta-phi)` ,then `tantheta ` is equal to a.`((1+m)/(1-m))t a n\ varphi` b. `((1-m)/(1+m))t a n\ varphi` c.`((1-m)/(1+m))cot\ varphi` d. `((1+m)/(1-m))cot\ varphi`

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ALLEN-TRIGONOMETRIC RATIOS AND IDENTITIES-All Questions
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  6. The expression 3[sin^4(3/2pi-alpha)+sin^4(3pi+alpha)]-2[sin^6(1/2pi+al...

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  11. If A and C are two angles such that A+C=(3pi)/4 then (1+cotA)(1+cotC)=

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  12. (log)(t1)(4sin9^0cos9^0)w h e r e\ t1=4sin 63^0cos 63^0\ e q u a l s ...

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  14. If (a+b)tan(theta-varphi)=(a-b)tan(theta+varphi),\ t h e n(sin(2theta)...

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  16. (sin^3theta-cos^3theta)/(sintheta-costheta)-(costheta)/(sqrt(1+cot^2th...

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  18. It is known that sin beta= 4/5 and 0 lt beta lt pi, then the value of ...

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  19. In a Delta ABC, angle B lt angle C and the values of B and C satisfy t...

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  20. Prove that ((cos A + cos B)/( sin A - sin B )) ^(n) + ((sin A + sin B ...

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