1.

sinSx + sin 3x 3 =tandxcos5x + cos3x

Answer»

LHS : apply SIN A+ SIN B and COS A + COS B formulae

2sin4xcosx / 2cos4xcosx ( 2 and cos x get cancelled )

we are left with : sin4x / cos 4x = tan4x ( since , sinx / cosx = tanx )



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