prove that 2(sin^6 A+cos^6 A)-3(sin^4 A+cos^4 A)+1=0
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Answered by
1
Step-by-step explanation:
2(sin⁶θ+cos⁶θ)-3(sin⁴θ+cos⁴θ)+1
= 2{(sin²θ)³+(cos²θ)³}-3{(sin²θ)²+(cos²θ)²}+1
= 2{(sin²θ+cos²θ)³-3sin²θcos²θ(sin²θ+cos²θ)}-3{(sin²θ+cos²θ)²-2sin²θcos²θ}+1
=2(1-3sin²θcos²θ)-3(1-2sin²θcos²θ)+1
=2-6sin²θcos²θ-3+6sin²θcos²θ+1
=-1+1
=0 (Proved)
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Answered by
3
prove that 2(sin^6 A+cos^6 A)-3(sin^4 A+cos^4 A)+1=0
2(sin⁶θ+cos⁶θ)-3(sin⁴θ+cos⁴θ)+1
= 2{(sin²θ)³+(cos²θ)³}-3{(sin²θ)²+(cos²θ)²}+1
= 2{(sin²θ+cos²θ)³-3sin²θcos²θ(sin²θ+cos²θ)}-3{(sin²θ+cos²θ)²-2sin²θcos²θ}+1
=2(1-3sin²θcos²θ)-3(1-2sin²θcos²θ)+1
=2-6sin²θcos²θ-3+6sin²θcos²θ+1
=-1+1
=0 (Proved)
HOPE SO IT IS HELPFUL..✌️❣️..
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