Question

prove tahat cos square teta -sin square teta= 2 cos square teta =1​

Answer 1

Answer:

Step-by-step explanation:

this is your question

L.H.S. = $cos^{2} A - sin^{2} A = 2cos^{2} - 1$

we know that,

$sin^{2} A = 1 - cos^{2} A$

Thus,

$cos^{2} A - 1 + cos^{2} A \\\\= 2cos^{2} A - 1 = R.H.S.$

hence proved\

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