(cos⁴A-sin⁴A) is equal to??
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Answer:
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Answer:
1-2sin^2A
Step-by-step explanation:
=cos^4 A- Sin^4A
=(Cos^2A-Sin^2A)(Cos^2A+Sin^2A) --- { (a+b)(a-b)=a^2-b^@ }
=Cos^2A-Sin^2A ----- { sin^2 A + Cos^2A=1 }
=1-2sin^2A
hence proved
similar end answers:
=2Cos^2A-1;
=Cos^2A-Sin^2A;
=(cosA-sinA)(cosA+sinA)
and peace
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