Question

If secA = 5/4, verify 3sinA-4sin^3by 4cos^3A-3cosA= 3tanA- tan ^3 by 1-3 ten ^2A

Answer 1

Answer:

Step-by-step explanation:

Ok from sec = 5/4 we can find hypo = 5k, adj side  = 4k and opp side = 3k where k is any positive no

now substituting these values in LHS and RHS we get RHS = LHS = 117/44