evaluate (sin A + cos A)² + (sin A- cos A)²
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evaluate (sin A + cos A)² + (sin A- cos A)²
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Answer:
2
Step-by-step explanation:
(sinA +cosA)² +(sin A -cosA)²
(sin²A +cos²A + 2sinAcosA) + (sin²A + cos²A - 2sinAcosA)
1 + 2sinAcosA + 1 - 2sinAcosA
= 1+1
=2
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Answer:
2
Step-by-step explanation:
=(sinA +cosA) ^2+ (sinA -cosA)^2
=( sin^2A+2sinAcosA+cos^2A) + (sin^2A- 2sinAcosA+ cos^2)
= ( sin^2A +cos^2A) +( sin^2A +cos^2A)
= 1+1
=2