let us show that :-
1) cos²75° - sin ²15° =0
2)cosec²48° - tan²42° = 1
plezz☺️ answer me fast guys
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answer for the given problem is given
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Answer:
1) LHS = cos²75 - sin²15
= cos²(45+30) - sin²(45-30)
= [(cos45.cos30)-(sin45.sin30)]² - [(sin45.cos30)-(cos45.sin30)]²
= (1 / root2 × root3 / 2 - 1
/root2 × 1/2)² - (1/root2 × root3/2 - 1/root2 × 1/2)²
= 0 [as all terms are cancelled]
= RHS
Therefore, LHS = RHS
Hence proved.
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