Question

Write the formula of tanC-tanD

Answer 1

we know that,

tanA= sinA-cosA

sin(A-B)= sinAcosB-sinBcosA

now we have find,

tanC-tanD,

(sinC/cosC) - (sinD/cosD)

(sinC cosD -sinD cosC)/ (cosC cosD)

sin(C-D)/cosC cosD

Answer 2

Answer:

tanc-tand=sinc-d/cosaCcosD