Math, asked by kavitarajpal82, 10 months ago

21. Prove that
Sec20 - cos20 = Sin20(Sec20 + 1)

Answers

Answered by vanshika4390

1

lhs

sec20-cos20

1/cos20- cos 20

(1-cos²20)/cos 20

sin²20/cos20

tan20.sin20

rhs

sin20(1/cos20+1)

sin20([1+cos20]/cos20)

(sin20+sin20.cos20)/cos20

tan 20.sin20

hence, proved

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