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cos 48^@ - sin 42 ^@ = ?...

` cos 48^@ - sin 42 ^@ = ? `

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cos^2 48^@-sin^2 12^@=

Let z_(1)= cos 12^(@) + I sin 12^(@) and z_(2) = cos 48^(@) + i. sin 48^(@) . Write complex number (z_(1) + z_(2)) in polar form. Find its modulus and argument.

Let z_(1)= cos 12^(@) + I sin 12^(@) and z_(2) = cos 48^(@) + i. sin 48^(@) . Write complex number (z_(1) + z_(2)) in polar form. Find its modulus and argument.

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Find the value of (cos48^(@)-sin42^(@))

Evaluate cos 48^(@) cos 42^(@) - sin48^(@) sin 42^(@)