Math, asked by shreyaslifts, 1 year ago

If 2 cos^2 + 3 cos = 2 then find cos

kunal0912: 1/2

shreyaslifts: Please tell me how did you solve buddy

shreyaslifts: Did you took cos theta = x

kunal0912: yes

Answers

Answered by Anonymous

hope it will help you

Attachments:

shreyaslifts: Okay. That's new for me. Well thanks for the answer. If possible please share me the formula you used

shreyaslifts: Okay okay got it

shreyaslifts: No, 11th. actually I forgot the formula

shreyaslifts: so I asked

shreyaslifts: Ya I know. but sometimes hota hain

Answered by kunal0912

Let cos theta = x

so, 2x^2 + 3x - 2 =0

so, 2x^2 + 4x - x -2 = 0

2x(x+2) -1(x+2) = 0

Hence, x = 1/2 or x = -2

but value of cos theta cannot be -2

Hence cos theta = 1/2

Hence, theta = 60°

shreyaslifts: Thank you kunal.

kunal0912: wlcm

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