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Step-by-step explanation:
5) [√1+sinx + √1-sinx]²/ 1+cosx
=> [1+sinx + 1-sinxx+ 2(√1+sinx)(√1-sinx)]/1+cosx
=> [2+2(√1-sin²x)]/1+cosx
=> 2+2cosx/ 1+cosx
=> 2(1+cosx)/(1+cosx)
=> 2 Answer option B
4) sin⁴x - cos⁴x - 1
=> (sin²x)² - (cos²x)² - 1
=> (sin²x + cos²x)(sin²x - cos²x) - 1
=> (1)(1-cos²x - cos²x) - 1
=> 1 - 2cos²x - 1
=> - 2cos²x Answer Option B
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