sin5x-sin3x/cos5x+cos3x=?
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Answer:
tanx
Step-by-step explanation:
sin5X -sin3X /cos5x+cos3x= 2cos(5X+3X )/2×sin (5X-3X)/2÷ 2cos(5X+3X)/2 ×cos(5X-3X)/2 ⇒(By the formula ) [sina -sinb =2cos( a+b/2) sin(a-b/2)] and [ cosa+cosb =2cos(a+b/2) cos(a-b/2)] ⇒2cos4x sinx ÷2cos4x cosx =tanx .
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