Math, asked by govinda03, 11 months ago

with out using calculator find the valu of cos (105)

Answers

Answered by NightFury

Using identity

Cos(A+B) = cosAcosB -sinAsinB

Cos(60+45) = cos60cos45 -sin60sin45

Cos(105) = 1/2 × 1/√2 - √3/2 × 1/√2

Cos(105) = 1/2√2 - √3/2√2

Cos(105) = 1-√3/2√2

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with out using calculator find the valu of cos (105)​

Answers

with out using calculator find the valu of cos (105)