Question

If sin a + sin square is equal to 1 then find the value of cos square a + cos 4a

Answer 1

HOPE IT HELPS YOU!!

Step-by-step explanation :

★ Given :-

→ sin∅ + sin²∅ = 1 .

★ To find :-

→ cos²∅ + cos⁴∅ .

★ Solution :-

We have,

°•° sin∅ + sin²∅ = 1 .

==> sin∅ = 1 - sin²∅ .

==> sin∅ = cos²∅ .

[ Squaring both side ] .

==> sin²∅ = cos⁴∅ .......... ( i ) .

★ Now,

°•° cos²∅ + cos⁴∅ .

= cos²∅ + sin²∅ . [ Using ( i ) ] .

= 1 .

[ •°• sin²∅ + cos²∅ = 1 . ]

★THANK YOU BRO/SIS★

Answer 2

solution is attached above .....