✧ Question ✧✧✦ ➠ ᴅᴏɴᴛ sᴘᴀᴍ⚠️ If sinx+siny+sinz=3. Find the value of cos^3x+cos^3y+cos^3z.
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sinx+siny+sinz=3. Find the value of cos^3x+cos^3y+cos^3z.
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Answer:
∑ cos 3x = 4 ∑ cos3 x - 3 ∑ cos x = 4 ∑ a3 - 0
Now if a + b + c = 0 then a3+b3+c3=3abc.
∴ ∑ cos3x=4.3(cosxcosycosz).
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