Find the value of $cos 7 5^{o}$ .

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Find the value of

cos 7 5^{o}

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Text solutionVerified

cos (7 5^{o}) = cos (4 5^{o} + 3 0^{o})

= cos 4 5^{o} cos 3 0^{o} - sin 4 5^{o} sin 3 0^{o}

= \frac{3}{2 2} - \frac{1}{2 2}

= \frac{3 - 1}{2 2}

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