Question

if cos a = 1÷2,then find the value of 1-cos^2 a ​

Answer 1

Step-by-step explanation:

see the attachment~~

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Answer 2

Step-by-step explanation:

solve:.

$cosa = \frac{aadhar}{karn} = \frac{1}{2} \\ so \\ aahar = 1 \\ karn = 2 \\ karn {}^{2} =lamb {}^{2} + aadhar {}^{2} \\ (2) { }^{2} = lamb {}^{2} + (1) {}^{2} \\ 4 = lamb {}^{2} + 1 \\ lamb {}^{2} = 3 \\lamb = \sqrt{3} \\ so \\1 - cos {}^{2}a \\ 1 - ( \frac{aadhar}{karn} ) {}^{2} \\ 1 - ( \frac{1}{2}) {}^{2} \\ 1 - \frac{1}{4 } \\ \frac{4 - 1}{4} \\ \frac{3}{4} \\ i \: hope \: it \: will \: help \: you$