19. If 8 tan x = 15, then the value of sin2x-cos2x is
(a161/289 (b)289/161 (c)161/64 (d) 64/225
Answers
Answered by
8
Answer:
option A
Step-by-step explanation:
tanx=15/8
hypotenuse= 17( by Pythagoras theorem)
sinx= 15/17
cosx=8/17
sin2x-cos2x
=(15/17)^2-(8/17)^2
=(225/289)-(64/289)
=161/289
option A
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