how to solve3,4,5,6,7,8 pl pl
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3...(1+tan^2 )(1+sin)(1-sin)
=(1+sin^2/cos^2)(1-sin^2)
Since...(a+b)(a-b)=a^2-b^2
=cos^2+sin^2/cos^2(cos^2)
=1/cos^2(cos^2)
=1
=(1+sin^2/cos^2)(1-sin^2)
Since...(a+b)(a-b)=a^2-b^2
=cos^2+sin^2/cos^2(cos^2)
=1/cos^2(cos^2)
=1
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