Question:
Sir How to find value of tan420? Or sec(-5Ï€/4)
Thank
Answer:
sin 420 = sin(360 + 60) = sin 60 = √3/2
cos 420 = cos(360 + 60) = cos 60 = 1/2
Now, tan 420 = sin 420/cos 420
= (√3/2)/(1/2)
= √3
So, tan 420 = √3
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