19)
Prove that sinx+sin3x + sin 5 x + Sin7x÷
cosx+ cos 3x + cos 5x + cos7x=
tan4x
Answers
Answered by
0
Answer:
sinx−sin3x+sin5x−sin7x
=
(cosx−cos3x)−(cosx−cos7x)
(sinx−sin3x)+(sin5x−sin7x)
=
2sin2xsinx−2sin6xsinx
2cos2xsin(−x)+2cos6xsin(−x)
2sinx[sin2x−sin6x]
−2sin(x)[cos2+cos6x]
2cos4(x)sin(−2x)
−2cos4(x)cos2x
=cot(2x)
Answered by
0
Answer:
heisbskwkw kzoss sis ssj
Similar questions